Company lists · Data refreshed September 2026
Top 25 Open source marketing automation software companies based in the United States
RevenueBase identified 171 open source marketing automation software companies headquartered in the United States as of September 2026 and tracks 3,152 professional contacts across them, including 787 with verified work emails and 625 with mobile numbers. Los Angeles is the largest hub.
This list covers open source marketing automation 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 marketing automation software companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 572 | ||||
“Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 210 | ||||
“Act-On Software provides the innovative marketing automation platform for marketers who think big and act boldly.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 192 | ||||
“With Keap, you'll easily capture, organize, track, and nurture all of your leads to increase sales and revenue.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 180 | ||||
“SendPulse is an AI-driven marketing platform that helps scaling businesses automate email and chatbot conversations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 159 | ||||
“RightWave provides Marketing Automation Services for B2B companies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 115 | ||||
“Benchmark helps busy marketers move faster and make a bigger impact with email.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 104 | ||||
“Genesis Digital empowers entrepreneurs and small business owners to achieve financial freedom with affordable and easy-to-use marketing and sales automation software, and a…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 72 | ||||
“SharpSpring is a full-funnel marketing and sales automation platform that unites marketing and sales teams to launch and track targeted campaigns and personalize every interaction…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 64 | ||||
“The time-saving CRM For sales and marketing teams who want to maximize efficiency and revenue, Nutshell is a CRM and marketing automation platform that saves time and accelerates…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 64 | ||||
“Lead Liaison is an application development company that designs, develops, and sells cloud-based marketing and sales automation software.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 57 | ||||
“EngageBay offers innovative AI-powered marketing and sales tools designed for small to medium-sized businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 52 | ||||
“MAXA is the real estate and mortgage industry's #1 marketing center.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 48 | ||||
“Sendcrux labs is building sales and marketing automation tools to help organisations to achieve the following goals cost-effectively- Boost revenues- Lead Generation- Nurture…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 37 | ||||
“InfiniteChoice was founded on the belief that the innovative use of technology and automation can unlock greater choice and better experiences for customers and partners.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 36 | ||||
“Eloqua, a wholly-owned subsidiary of Oracle, is the leading provider of modern marketing automation and revenue performance management software that helps ensure every component…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 25 | ||||
“Delivra, a Redbrick company, is a sophisticated email platform that designs custom solutions to help marketers and agencies automate highly personalized, event-driven campaigns…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | VOLLYStrong evidence | 25 | |||
“With Volly’s Marketing Automation Suite you can more easily capture, convert, and retain customers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 25 | ||||
“Mailmunch is the one-stop lead generation and marketing platform that allows you to grow your business with lead capture and email automation tools to reach your audience with a…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | PamingaStrong evidence | 22 | |||
“Paminga is a marketing automation platform built for Marketing Operations professionals, the people who actually live in the platform, not just buy it.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | JustunoStrong evidence | 20 | |||
“Justuno is a website marketing automation platform designed to increase leads and revenue for thousands of businesses worldwide.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 18 | ||||
“With the hosted Ethofy Inspired Marketing suite, marketers have a way to recapture their time and repurpose their budget dollars.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 18 | ||||
“Real Magnet is a leading marketing automation platform that helps businesses attract, engage and deliver better email, marketing, social and mobile campaigns.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Halo ProgramsIndirect evidence | 18 | |||
“Halo Programs have been helping Mortgage, Real Estate, and Residential Heating and Cooling companies to cultivate customer relationships for over 50 years.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 16 | ||||
“At Strategic Marketer, we are passionate about providing a complete suite of best-in-class marketing automation software, strategies and support to empower businesses to start up…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | SingulateStrong evidence | 15 | |||
“We're building the next gen AI marketing automation platform called Singulate.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 171 open source marketing automation 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 787 reachable decision-makers.
Free signup · no credit card
Open source marketing automation 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 marketing automation 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 marketing automation 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 marketing automation 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, 787 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 marketing automation software companies are there based in the United States?
RevenueBase identified 171 open source marketing automation 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?
Adobe Marketo, headquartered in San Jose, tops this list with the largest team on record.
Which city has the most open source marketing automation software companies?
Los Angeles leads with 8 headquartered companies, followed by New York (6) and Dallas (5).
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 787 verified decision-maker contacts tracked across these 171 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 171 open source marketing automation 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 marketing automation 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