Company lists · Data refreshed September 2026
Top 24 Open source contact management software companies based in the United States
RevenueBase identified 77 open source contact management software companies headquartered in the United States as of September 2026 and tracks 477 professional contacts across them, including 103 with verified work emails and 141 with mobile numbers. New York is the largest hub.
This list covers open source contact management software companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
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 24 largest open source contact management software companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 67 | ||||
“Insightly, the new breed of CRM, helps modern businesses of all sizes build lifelong customer relationships and grow faster than ever before.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 32 | ||||
“CRMOne is a leading CRM platform that helps businesses to manage day-to-day business activities in one place.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Less Annoying CRMIndirect evidence | 28 | |||
“Less Annoying CRM is a simple CRM built from the ground up for small businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 22 | ||||
“OnePageCRM is an ultra-simple yet powerful CRM system built for small businesses in the consulting and professional services industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 20 | ||||
“Claritysoft helps growing businesses manage customer relationships with ease.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 17 | ||||
“eWay-CRM is the best CRM for Microsoft Outlook.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 17 | ||||
“Avidian was founded in 2005 in the Seattle Metropolitan area by a diverse team of sales, business, and technical professionals, passionate about creating a user-friendly CRM.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 15 | ||||
“Are your leads falling through the cracks?” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Mautic Marketing AutomationStrong evidence | 12 | |||
“Mautic empowers businesses and organizations to deliver fully integrated marketing campaigns with a world-class open source marketing automation product, supported by a thriving…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 11 | ||||
“SalesOptima is an online Customer Relationship Management (CRM) service that conveniently enables you to organize, manage, and nurture your customer contacts in the office or on…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 | ||||
“Known as the most affordable and easy-to-use CRM for sales professionals and small businesses, LionDesk allows you to go from Lead to Close in a highly customizable platform.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 7 | ||||
“CRMBOOST provides tools and services to help businesses manage their prospective leads and clients, and help them use the internet to market their products and services…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 6 | ||||
“Hey there!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 5 | ||||
“AllClients provides simple contact management and marketing automation in one, easy-to-use system.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 | ||||
“At, our mission is to provide small business owners and entrepreneurs with a user friendly and all-inclusive platform that simplifies operations and helps them grow their brand.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | DEXIndirect evidence | 4 | |||
“Dex is a personal CRM that helps you keep in touch, remember where you left off, and build stronger relationships.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | Brilliance CRMPartial evidence | 2 | |||
“Brilliance CRM is a powerful cloud-based solution designed to streamline customer relationship management.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | Soft Edge MarketingPartial evidence | 2 | |||
“Businesses and nonprofits often miss out on money making opportunities because they lack the resources to build stronger relationships with their contacts.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Chaos Software Group, INCIndirect evidence | 2 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | FlectrahqStrong evidence | 2 | |||
“Flectra is The Open Source ERP and CRM System For Your Business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 | ||||
“CRM Pro Partners is dedicated to the successful implementation of Contact Relationship Management (CRM) software within a business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | HaystackcrmIndirect evidence | 2 | |||
“HaystackCRM is the premier CRM solution for small to medium businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | JoggleIndirect evidence | 1 | |||
“The uncomplicated mobile sales CRM.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | Gold Coast Advisors, INCStrong evidence | 1 | |||
“Gold Coast Advisors develop contact management and Customer Relationship Management (CRM) solutions for all sizes of local, regional, and international businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 24 of 77 open source contact management software companies based in the United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 103 reachable decision-makers.
Free signup · no credit card
Open source contact management software companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among open source contact management software companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- 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.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “open source contact management software companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among open source contact management software companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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 listed company carries at least one verified work email, 103 across the full list. 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 September 5, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
How many open source contact management software companies are there based in the United States?
RevenueBase identified 77 open source contact management software companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Insightly CRM By Unbounce, headquartered in San Francisco, tops this list with the largest team on record.
Which city has the most open source contact management software companies?
New York leads with 4 headquartered companies, followed by San Francisco (4) and Atlanta (2).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 103 verified decision-maker contacts tracked across these 77 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 77 open source contact management software companies based in the United States. Start with a free account, no credit card.
Get the full listRelated lists
Browse the directory
Browse: Companies home · All United States lists · All Open source contact management software companies lists · New lists
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
- All company lists
- Lists by location
- Lists A-Z
- New lists
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
- Media companies based in the United States
- Oil and gas companies based in the United States
- Real estate companies based in the United States