Company lists · Data refreshed September 2026
Top 25 Open source CRM software companies based in the United States
RevenueBase identified 152 open source CRM software companies headquartered in the United States as of September 2026 and tracks 13,560 professional contacts across them, including 8,317 with verified work emails and 4,028 with mobile numbers. New York is the largest hub.
This list covers open source CRM 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 25 largest open source CRM software companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 11,077 | ||||
“HubSpot is a leading agentic customer platform that provides software and support to help businesses grow better.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 970 | ||||
“Founded in 2010, Pipedrive is an easy and effective sales CRM that drives small business growth.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 127 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 118 | ||||
“Stop playing house and start closing deals.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 116 | ||||
“Bringing the power of enterprise CRM to your business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 114 | ||||
“Paramantra builds enterprise software.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 70 | ||||
“Builder Prime is the all-in-one CRM built for growth-minded home improvement companies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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. | |||||
| 9 | 37 | ||||
“Clear C2, Inc is based in Coppell, Texas, and is a leading technology company providing Customer Relationship Management(CRM) companies of all sizes.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | TwentyStrong evidence | 37 | |||
“Building the modern Salesforce, powered by the Open Source community: http://github.com/twentyhq/twenty” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 37 | ||||
“Welcome to Salesmate Salesmate is the Unified Customer Platform that brings your sales, marketing, and support teams together on a single source of customer truth.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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. | |||||
| 13 | Less Annoying CRMPartial 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. | |||||
| 14 | 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. | |||||
| 15 | 20 | ||||
“Claritysoft helps growing businesses manage customer relationships with ease.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 17 | ||||
“eWay-CRM is the best CRM for Microsoft Outlook.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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. | |||||
| 18 | 15 | ||||
“Are your leads falling through the cracks?” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | General Data Systems, INCPartial evidence | 13 | |||
“General Data Systems offers ERP software specifically for the wholesale distribution industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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. | |||||
| 21 | 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. | |||||
| 22 | 11 | ||||
“Commence Corporation is a leading provider of Customer Relationship Management Software serving small to mid-size enterprises.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 11 | ||||
“Collaborative sales management and CRM software for startups and SMBs.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 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. | |||||
| 25 | 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. | |||||
Showing 25 of 152 open source CRM software companies based in the United States
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Open source CRM 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 CRM 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 CRM 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 CRM 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, 8,317 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 CRM software companies are there based in the United States?
RevenueBase identified 152 open source CRM 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?
Hubspot, headquartered in Cambridge, tops this list with the largest team on record.
Which city has the most open source CRM software companies?
New York leads with 8 headquartered companies, followed by San Francisco (6) and Denver (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 8,317 verified decision-maker contacts tracked across these 152 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.
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