Company lists · Data refreshed November 2026
Top 25 Open source security software companies worldwide
RevenueBase identified 246 company matches for open source security software companies worldwide as of November 2026 and tracks 2,643 professional contacts across them, including 978 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for open source security software companies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 5, 2026. Country and city lists for open source security software companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest open source security software companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 417 contacts → | ||||
Exact match “The Open Worldwide Application Security Project (OWASP) is a worldwide free and open community focused on improving the security of software.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 2 | 357 contacts → | ||||
Exact match “Bishop Fox is recognized as the leading authority in offensive security, providing solutions ranging from continuous penetration testing, red teaming, and attack surface…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 3 | 259 contacts → | ||||
Exact match “Software development has changed.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 235 contacts → | ||||
Exact match “Filigran, a cybersecurity company, delivers a unique open-source, threat-informed approach to Continuous Threat Exposure Management (CTEM).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 110 contacts → | ||||
Exact match “With over installations worldwide, Greenbone is the most widely used provider of open source vulnerability management.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 81 contacts → | ||||
Exact match “Secure networks start here.™ Netgate is focused on delivering secure high-performance network connectivity for everyone.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 52 contacts → | ||||
Exact match “A Viaconnect surgiu no ano com o objetivo de suprir uma necessidade das empresas da época: Proteção e Controle da Internet.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 47 contacts → | ||||
Exact match “Software ships daily.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 41 contacts → | ||||
Exact match “Magenta arbejder udelukkende med open source og har som kerneydelse at skabe åbne og ansvarlige it-løsninger.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 37 contacts → | ||||
Exact match “Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 34 contacts → | ||||
Exact match “Root eliminates the CVE grind by delivering open source that is clean of vulnerabilities, secured by default, and ready to use without engineering effort.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 28 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 27 contacts → | ||||
Exact match “Acunetix was founded to combat the alarming rise in web attacks.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 24 contacts → | ||||
Exact match “Doug Burks started the Security Onion project in 2008 to provide a free and open source platform for intrusion detection, network security monitoring, and log management to help…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 24 contacts → | ||||
Exact match “BitNinja provides 3E Linux server protection for large hosting providers and small businesses equally.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 19 contacts → | ||||
Exact match “Welcome to OSMO Welcome to OSMO, the only IT consulting company in Central India providing fully FOSS (free and open source software) solutions!” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 17 contacts → | ||||
Exact match “With our expertise we create security solutions that are robust and easy to use, leveraging leading open source technology.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 16 contacts → | ||||
Exact match “SecZoneS-SDLC SecZoneWEB SecZonegoogle10SecZone “+”SecZone“”Web“+”” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 14 contacts → | ||||
Exact match “Security is of utmost concern for embedded software used in mobile, IoT, and automotive industries.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 14 contacts → | ||||
Exact match “RapidFire Tools was acquired in 2018 by Kaseya.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 14 contacts → | ||||
Exact match “Information Security - Software Development - System Integration - Data Privacy Port Zero creates and maintains software systems, with an eye for security, data privacy and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 11 contacts → | ||||
Exact match “In 2004, we founded KoreLogic to build an IT security company that was respected for the quality of its work and the caliber of our staff.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 11 contacts → | ||||
Exact match “KMS S/W(Secure SDLC).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 10 contacts → | ||||
Exact match “Atomicorp eliminates the high cost, complexity and burden of cybersecurity and compliance by harnessing and extending the power of Open Source Security (OSSEC), ModSecurity WAF…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 9 contacts → | ||||
Exact match “Com vasta experiência em tecnologias de CiberSecurity, a BR Flecha desenvolveu uma abordagem inovadora e integral na Segurança de TI: Validação Contínua de Segurança.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “open source security software companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 246 open source security software companies worldwide
See the full list, filter by size, metro and specialty, and access 978 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Open source security software companies worldwide at a glance
As of Nov 5, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for open source security software companies are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “open source security software companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 978 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on November 5, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Open source security software companies by location
1 lists · largest firstEvery Open source security software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “open source security software companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many open source security software companies are there worldwide?
RevenueBase identified 246 company matches for open source security software companies worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Owasp Foundation tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most open source security software companies?
The United States leads with 38 companies. Every open source security software companies list by country and city is linked on this page.
Which city has the most open source security software companies?
London leads with 6 company records, followed by Berlin (4) and Paris (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 978 professional contacts with verified work emails tracked across these 246 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 246 open source security software companies worldwide. Start with a free account, no credit card.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
Company intelligence · public preview
Top 25 open source security software companies worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 246 matching company records for open source security software companies worldwide, with 2,643 tracked contacts and 978 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 5, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 open source security software companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Owasp Foundationowasp.orgHQ: Wilmington, DE, United StatesReported employees: Not recorded | Wilmington, DE, United States | Not recorded | Exact match | 417 contacts → |
“The Open Worldwide Application Security Project (OWASP) is a worldwide free and open community focused on improving the security of software.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Bishop FOXbishopfox.comHQ: Tempe, AZ, United StatesReported employees: 201-500 | Tempe, AZ, United States | 201-500 | Exact match | 357 contacts → |
“Bishop Fox is recognized as the leading authority in offensive security, providing solutions ranging from continuous penetration testing, red teaming, and attack surface…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Aikido Securityaikido.devHQ: Ghent, BelgiumReported employees: 201-500 | Ghent, Belgium | 201-500 | Exact match | 259 contacts → |
“Software development has changed.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Filigranfiligran.ioHQ: Paris, United StatesReported employees: 201-500 | Paris, United States | 201-500 | Exact match | 235 contacts → |
“Filigran, a cybersecurity company, delivers a unique open-source, threat-informed approach to Continuous Threat Exposure Management (CTEM).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Greenbone AGgreenbone.netHQ: Osnabrueck, GermanyReported employees: 51-200 | Osnabrueck, Germany | 51-200 | Exact match | 110 contacts → |
“With over installations worldwide, Greenbone is the most widely used provider of open source vulnerability management.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Netgatenetgate.comHQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 81 contacts → |
“Secure networks start here.™ Netgate is focused on delivering secure high-performance network connectivity for everyone.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Viaconnectviaconnect.com.brHQ: Caxias Do Sul, BrazilReported employees: 11-50 | Caxias Do Sul, Brazil | 11-50 | Exact match | 52 contacts → |
“A Viaconnect surgiu no ano com o objetivo de suprir uma necessidade das empresas da época: Proteção e Controle da Internet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Projectdiscoveryprojectdiscovery.ioHQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 47 contacts → |
“Software ships daily.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Magentamagenta.dkHQ: Copenhagen, DenmarkReported employees: 11-50 | Copenhagen, Denmark | 11-50 | Exact match | 41 contacts → |
“Magenta arbejder udelukkende med open source og har som kerneydelse at skabe åbne og ansvarlige it-løsninger.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Lyra Infosystemslyrainfo.comHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 37 contacts → |
“Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  ROOTroot.ioHQ: Boston, MA, United StatesReported employees: 11-50 | Boston, MA, United States | 11-50 | Exact match | 34 contacts → |
“Root eliminates the CVE grind by delivering open source that is clean of vulnerabilities, secured by default, and ready to use without engineering effort.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  OSBCosbc.co.krHQ: 서울특별시, South KoreaReported employees: 11-50 | 서울특별시, South Korea | 11-50 | Exact match | 28 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 |  Acunetix By Invictiacunetix.comHQ: Austin, United StatesReported employees: 51-200 | Austin, United States | 51-200 | Exact match | 27 contacts → |
“Acunetix was founded to combat the alarming rise in web attacks.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Security Onion Solutions, LLCsecurityonionsolutions.comHQ: Evans, GA, United StatesReported employees: 11-50 | Evans, GA, United States | 11-50 | Exact match | 24 contacts → |
“Doug Burks started the Security Onion project in 2008 to provide a free and open source platform for intrusion detection, network security monitoring, and log management to help…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Bitninja Securitybitninja.comHQ: Debrecen, HungaryReported employees: 11-50 | Debrecen, Hungary | 11-50 | Exact match | 24 contacts → |
“BitNinja provides 3E Linux server protection for large hosting providers and small businesses equally.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Osmo IT Solution Private Limitedosmoindia.comHQ: Bhopal, IndiaReported employees: 11-50 | Bhopal, India | 11-50 | Exact match | 19 contacts → |
“Welcome to OSMO Welcome to OSMO, the only IT consulting company in Central India providing fully FOSS (free and open source software) solutions!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  9elements Cyber Security9esec.ioHQ: Bochum, GermanyReported employees: 11-50 | Bochum, Germany | 11-50 | Exact match | 17 contacts → |
“With our expertise we create security solutions that are robust and easy to use, leveraging leading open source technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Seczone 开源网安seczone.cnHQ: 深圳市, ChinaReported employees: 51-200 | 深圳市, China | 51-200 | Exact match | 16 contacts → |
“SecZoneS-SDLC SecZoneWEB SecZonegoogle10SecZone “+”SecZone“”Web“+”” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Insignaryinsignary.comHQ: Toronto, ON, CanadaReported employees: 11-50 | Toronto, ON, Canada | 11-50 | Exact match | 14 contacts → |
“Security is of utmost concern for embedded software used in mobile, IoT, and automotive industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Rapidfire Toolsrapidfiretools.comHQ: Atlanta, GA, United StatesReported employees: 11-50 | Atlanta, GA, United States | 11-50 | Exact match | 14 contacts → |
“RapidFire Tools was acquired in 2018 by Kaseya.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Port Zeroport-zero.comHQ: Berlin, GermanyReported employees: 11-50 | Berlin, Germany | 11-50 | Exact match | 14 contacts → |
“Information Security - Software Development - System Integration - Data Privacy Port Zero creates and maintains software systems, with an eye for security, data privacy and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Korelogickorelogic.comHQ: Annapolis, MD, United StatesReported employees: 11-50 | Annapolis, MD, United States | 11-50 | Exact match | 11 contacts → |
“In 2004, we founded KoreLogic to build an IT security company that was respected for the quality of its work and the caliber of our staff.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  KMS Technologykmstech.co.krHQ: Seoul, South KoreaReported employees: 11-50 | Seoul, South Korea | 11-50 | Exact match | 11 contacts → |
“KMS S/W(Secure SDLC).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Atomicorpatomicorp.comHQ: Chantilly, VA, United StatesReported employees: 11-50 | Chantilly, VA, United States | 11-50 | Exact match | 10 contacts → |
“Atomicorp eliminates the high cost, complexity and burden of cybersecurity and compliance by harnessing and extending the power of Open Source Security (OSSEC), ModSecurity WAF…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  BR Flecha Cybersecuritybrflecha.com.brHQ: Brasilia, BrazilReported employees: 51-200 | Brasilia, Brazil | 51-200 | Exact match | 9 contacts → |
“Com vasta experiência em tecnologias de CiberSecurity, a BR Flecha desenvolveu uma abordagem inovadora e integral na Segurança de TI: Validação Contínua de Segurança.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 246 company matches
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Open source security software companies: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
243 records in the displayed employee bands.
3 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 246 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 5, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Open source security software companies by location
1 lists · largest firstEvery Open source security software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for open source security software companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many open source security software companies did RevenueBase find worldwide?
The saved snapshot records 246 matching company records, 2,643 tracked contacts and 978 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 5, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 open source security software companies worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/open-source-security-software-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 open source security software companies worldwide
RevenueBase records 246 matching company records for open source security software companies worldwide, with 2,643 tracked contacts and 978 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 5, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 open source security software companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Owasp Foundationowasp.org HQ: Wilmington, DE, United StatesReported employees: Not recorded | Wilmington, DE, United States | Not recorded | Exact match | 417 contacts → |
“The Open Worldwide Application Security Project (OWASP) is a worldwide free and open community focused on improving the security of software.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Bishop FOXbishopfox.com HQ: Tempe, AZ, United StatesReported employees: 201-500 | Tempe, AZ, United States | 201-500 | Exact match | 357 contacts → |
“Bishop Fox is recognized as the leading authority in offensive security, providing solutions ranging from continuous penetration testing, red teaming, and attack surface…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Aikido Securityaikido.dev HQ: Ghent, BelgiumReported employees: 201-500 | Ghent, Belgium | 201-500 | Exact match | 259 contacts → |
“Software development has changed.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Filigranfiligran.io HQ: Paris, United StatesReported employees: 201-500 | Paris, United States | 201-500 | Exact match | 235 contacts → |
“Filigran, a cybersecurity company, delivers a unique open-source, threat-informed approach to Continuous Threat Exposure Management (CTEM).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Greenbone AGgreenbone.net HQ: Osnabrueck, GermanyReported employees: 51-200 | Osnabrueck, Germany | 51-200 | Exact match | 110 contacts → |
“With over installations worldwide, Greenbone is the most widely used provider of open source vulnerability management.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Netgatenetgate.com HQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 81 contacts → |
“Secure networks start here.™ Netgate is focused on delivering secure high-performance network connectivity for everyone.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Viaconnectviaconnect.com.br HQ: Caxias Do Sul, BrazilReported employees: 11-50 | Caxias Do Sul, Brazil | 11-50 | Exact match | 52 contacts → |
“A Viaconnect surgiu no ano com o objetivo de suprir uma necessidade das empresas da época: Proteção e Controle da Internet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Projectdiscoveryprojectdiscovery.io HQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 47 contacts → |
“Software ships daily.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Magentamagenta.dk HQ: Copenhagen, DenmarkReported employees: 11-50 | Copenhagen, Denmark | 11-50 | Exact match | 41 contacts → |
“Magenta arbejder udelukkende med open source og har som kerneydelse at skabe åbne og ansvarlige it-løsninger.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Lyra Infosystemslyrainfo.com HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 37 contacts → |
“Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | ROOTroot.io HQ: Boston, MA, United StatesReported employees: 11-50 | Boston, MA, United States | 11-50 | Exact match | 34 contacts → |
“Root eliminates the CVE grind by delivering open source that is clean of vulnerabilities, secured by default, and ready to use without engineering effort.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | OSBCosbc.co.kr HQ: 서울특별시, South KoreaReported employees: 11-50 | 서울특별시, South Korea | 11-50 | Exact match | 28 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 | Acunetix By Invictiacunetix.com HQ: Austin, United StatesReported employees: 51-200 | Austin, United States | 51-200 | Exact match | 27 contacts → |
“Acunetix was founded to combat the alarming rise in web attacks.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Security Onion Solutions, LLCsecurityonionsolutions.com HQ: Evans, GA, United StatesReported employees: 11-50 | Evans, GA, United States | 11-50 | Exact match | 24 contacts → |
“Doug Burks started the Security Onion project in 2008 to provide a free and open source platform for intrusion detection, network security monitoring, and log management to help…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Bitninja Securitybitninja.com HQ: Debrecen, HungaryReported employees: 11-50 | Debrecen, Hungary | 11-50 | Exact match | 24 contacts → |
“BitNinja provides 3E Linux server protection for large hosting providers and small businesses equally.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Osmo IT Solution Private Limitedosmoindia.com HQ: Bhopal, IndiaReported employees: 11-50 | Bhopal, India | 11-50 | Exact match | 19 contacts → |
“Welcome to OSMO Welcome to OSMO, the only IT consulting company in Central India providing fully FOSS (free and open source software) solutions!” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | 9elements Cyber Security9esec.io HQ: Bochum, GermanyReported employees: 11-50 | Bochum, Germany | 11-50 | Exact match | 17 contacts → |
“With our expertise we create security solutions that are robust and easy to use, leveraging leading open source technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Seczone 开源网安seczone.cn HQ: 深圳市, ChinaReported employees: 51-200 | 深圳市, China | 51-200 | Exact match | 16 contacts → |
“SecZoneS-SDLC SecZoneWEB SecZonegoogle10SecZone “+”SecZone“”Web“+”” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Insignaryinsignary.com HQ: Toronto, ON, CanadaReported employees: 11-50 | Toronto, ON, Canada | 11-50 | Exact match | 14 contacts → |
“Security is of utmost concern for embedded software used in mobile, IoT, and automotive industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Rapidfire Toolsrapidfiretools.com HQ: Atlanta, GA, United StatesReported employees: 11-50 | Atlanta, GA, United States | 11-50 | Exact match | 14 contacts → |
“RapidFire Tools was acquired in 2018 by Kaseya.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Port Zeroport-zero.com HQ: Berlin, GermanyReported employees: 11-50 | Berlin, Germany | 11-50 | Exact match | 14 contacts → |
“Information Security - Software Development - System Integration - Data Privacy Port Zero creates and maintains software systems, with an eye for security, data privacy and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Korelogickorelogic.com HQ: Annapolis, MD, United StatesReported employees: 11-50 | Annapolis, MD, United States | 11-50 | Exact match | 11 contacts → |
“In 2004, we founded KoreLogic to build an IT security company that was respected for the quality of its work and the caliber of our staff.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | KMS Technologykmstech.co.kr HQ: Seoul, South KoreaReported employees: 11-50 | Seoul, South Korea | 11-50 | Exact match | 11 contacts → |
“KMS S/W(Secure SDLC).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Atomicorpatomicorp.com HQ: Chantilly, VA, United StatesReported employees: 11-50 | Chantilly, VA, United States | 11-50 | Exact match | 10 contacts → |
“Atomicorp eliminates the high cost, complexity and burden of cybersecurity and compliance by harnessing and extending the power of Open Source Security (OSSEC), ModSecurity WAF…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | BR Flecha Cybersecuritybrflecha.com.br HQ: Brasilia, BrazilReported employees: 51-200 | Brasilia, Brazil | 51-200 | Exact match | 9 contacts → |
“Com vasta experiência em tecnologias de CiberSecurity, a BR Flecha desenvolveu uma abordagem inovadora e integral na Segurança de TI: Validação Contínua de Segurança.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 246 company matches
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Open source security software companies: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
243 records in the displayed employee bands.
3 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 246 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 5, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Open source security software companies by location
1 lists · largest firstEvery Open source security software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for open source security software companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many open source security software companies did RevenueBase find worldwide?
The saved snapshot records 246 matching company records, 2,643 tracked contacts and 978 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 5, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 open source security software companies worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/open-source-security-software-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗