Company lists · Data refreshed September 2026

Top 25 Open source business software companies based in the United States

Name: Open source business software companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 105 companies tracked

RevenueBase identified 105 open source business software companies headquartered in the United States as of September 2026 and tracks 2,088 professional contacts across them, including 991 with verified work emails and 660 with mobile numbers. Austin is the largest hub.

This list covers open source business 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

105Companies

2,088Contacts tracked

991Verified emails

660Mobile numbers

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The 25 largest open source business software companies based in the United States

Ranked by team size

Top 25 of 105 open source business software companies based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names open source business software companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	AcumaticaIndirect evidence	Bellevue, WA, United StatesHQ checked Sep 5, 2026	501-1,000	729
	“Acumatica Cloud ERP is a comprehensive business management solution designed for today's digital economy.” Source: company website · checked Sep 5, 2026
2	PerconaStrong evidence	Durham, NC, United StatesHQ checked Sep 5, 2026	201-500	322
	“Percona is widely recognized as a world-class open source database software, support, and services company.” Source: company website · checked Sep 5, 2026
3	VAI Vormittag Associates, INCPartial evidence	Ronkonkoma, NY, United StatesHQ checked Sep 5, 2026	201-500	153
	“VAI Company Overview VAI is a leading independent mid-market ERP software developer renowned for its flexible solutions and ability to automate critical business functions for the…” Source: company website · checked Sep 5, 2026
4	BCS ProsoftPartial evidence	San Antonio, TX, United StatesHQ checked Sep 5, 2026	11-50	57
	“BCS ProSoft is a leading provider of accounting and ERP business management software.” Source: company website · checked Sep 5, 2026
5	Accountmate Software CorporationPartial evidence	Petaluma, CA, United StatesHQ checked Sep 5, 2026	11-50	47
	“AccountMate Software Corporation Founded in 1984, AccountMate develops and markets fully modifiable business accounting software.” Source: company website · checked Sep 5, 2026
6	StrivenPartial evidence	Lumberton, NJ, United StatesHQ checked Sep 5, 2026	201-500	44
	“Striven is an all-in-one business management software that combines CRM, accounting, project management, inventory, and HR in a single system.” Source: company website · checked Sep 5, 2026
7	Openeducat, INCStrong evidence	Claymont, DE, United StatesHQ checked Sep 5, 2026	11-50	33
	“OpenEduCat is a comprehensive open source ERP for University, College & School, for efficient management of students, faculties, courses, and classes.” Source: company website · checked Sep 5, 2026
8	Crystal Computer ConsultingIndirect evidence	Janesville, WI, United StatesHQ checked Sep 5, 2026	11-50	19
	“Crystal Computer Consulting was founding in 1990, with the original mission to build customized business management and accounting packages for small to medium businesses.” Source: company website · checked Sep 5, 2026
9	Cornerstone Consulting, INCPartial evidence	Tampa, FL, United StatesHQ checked Sep 5, 2026	11-50	18
	“Cornerstone Consulting provides enterprise resource planning (ERP) software solutions that connect, integrate, track and report all aspects of business operations-from product…” Source: company website · checked Sep 5, 2026
10	ProqualityIndirect evidence	Dallas, TX, United StatesHQ checked Sep 5, 2026	11-50	15
	“ProQuality implements and supports the Windfall ERP system it has developed for manufacturing, distribution and retail organizations.” Source: company website · checked Sep 5, 2026
11	NovohitPartial evidence	Imperial, CA, United StatesHQ checked Sep 5, 2026	11-50	14
	“Novohit is a web-based ERP software suite for mid-size businesses.” Source: company website · checked Sep 5, 2026
12	General Data Systems, INCPartial evidence	Saint Louis, MO, United StatesHQ checked Sep 5, 2026	11-50	13
	“General Data Systems offers ERP software specifically for the wholesale distribution industry.” Source: company website · checked Sep 5, 2026
13	Marketplace SoftwarePartial evidence	Honolulu, HI, United StatesHQ checked Sep 5, 2026	11-50	11
	“Meet e-manage\|ONE, the brainchild of Marketplace Software, a comprehensive business management solution engineered to streamline and optimize a wide spectrum of operational…” Source: company website · checked Sep 5, 2026
14	465-media.comStrong evidence	Manchester, NH, United StatesHQ checked Sep 5, 2026	1-10	11
	“We are a small business that uses Open Source application to help other small businesses succeed on the Web.” Source: company website · checked Sep 5, 2026
15	TIW Technology, INCIndirect evidence	Easton, PA, United StatesHQ checked Sep 5, 2026	11-50	10
	“TIW Technology is the developer of the ALERE ERP suite.” Source: company website · checked Sep 5, 2026
16	Grokability, INCStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	8
	“SaaS solutions for small business IT, including the open source project Snipe-IT.” Source: company website · checked Sep 5, 2026
17	Stfb INCIndirect evidence	Labelle, FL, United StatesHQ checked Sep 5, 2026	11-50	8
	“New Product!” Source: company website · checked Sep 5, 2026
18	CentarroIndirect evidence	Greenville, SC, United StatesHQ checked Sep 5, 2026	1-10	7
	“Change is at the center of commerce.” Source: company website · checked Sep 5, 2026
19	Kennel ConnectionPartial evidence	Moorpark, CA, United StatesHQ checked Sep 5, 2026	11-50	7
	“We specialize in the development, sales, and support of affordable, state-of-the-art business management software that works the way you do.” Source: company website · checked Sep 5, 2026
20	Ruoom INCStrong evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	11-50	7
	“Free open source code you can run and adapt.” Source: company website · checked Sep 5, 2026
21	Plus & Minus Software CorporationPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	6
	“Plus & Minus is a developer of real-time, single-file, enterprise resource planning (ERP) software.” Source: company website · checked Sep 5, 2026
22	OSS ConsultantsIndirect evidence	Detroit, United StatesHQ checked Sep 5, 2026	1-10	6
	“OSS Consultants is a business dedicated to helping organizations of all sizes - from the world’s largest and well-known companies to small businesses and start-ups - design…” Source: company website · checked Sep 5, 2026
23	Analysis & Information Services, INCPartial evidence	Timonium, MD, United StatesHQ checked Sep 5, 2026	11-50	5
	“Analysis & Information Services is a 37 year old business software provider specializing in custom manufacturing, distribution, and service companies with complex workflows.” Source: company website · checked Sep 5, 2026
24	Invoice NinjaPartial evidence	Fort Myers, FL, United StatesHQ checked Sep 5, 2026	1-10	5
	“Invoice Ninja is a leading source-code available suite of apps focusing on SMB invoicing & payments.” Source: company website · checked Sep 5, 2026
25	TechcmIndirect evidence	Hollywood, FL, United StatesHQ checked Sep 5, 2026	1-10	5
	“TechCM’s solutions build on your existing infrastructure so all your departments are running together harmoniously and everyone is up-to-date with real-time data.” Source: company website · checked Sep 5, 2026

Showing 25 of 105 open source business software companies based in the United States

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Open source business software companies based in the United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

AustinLargest hub · 4 HQs

660Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Verified emails by last verification

0–30

933

31–60

61–90

90–180

180+

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 business 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 business 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 business 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, 991 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 business software companies are there based in the United States?

RevenueBase identified 105 open source business 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?

Acumatica, headquartered in Bellevue, tops this list with the largest team on record.

Which city has the most open source business software companies?

Austin leads with 4 headquartered companies, followed by Dallas (3) and Houston (3).

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 991 verified decision-maker contacts tracked across these 105 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.

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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.