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, its RevenueBase Smart Search rating, 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 Smart Search, 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 contacts → | ||||
Indirect evidence “Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 210 contacts → | ||||
Strong evidence “Act-On Software provides the innovative marketing automation platform for marketers who think big and act boldly.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 192 contacts → | ||||
Indirect evidence “With Keap, you'll easily capture, organize, track, and nurture all of your leads to increase sales and revenue.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 180 contacts → | ||||
Partial evidence “SendPulse is an AI-driven marketing platform that helps scaling businesses automate email and chatbot conversations.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 159 contacts → | ||||
Strong evidence “RightWave provides Marketing Automation Services for B2B companies.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 115 contacts → | ||||
Indirect evidence “Benchmark helps busy marketers move faster and make a bigger impact with email.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 104 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 72 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 64 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 64 contacts → | ||||
Strong evidence “Lead Liaison is an application development company that designs, develops, and sells cloud-based marketing and sales automation software.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 57 contacts → | ||||
Partial evidence “EngageBay offers innovative AI-powered marketing and sales tools designed for small to medium-sized businesses.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 52 contacts → | ||||
Partial evidence “MAXA is the real estate and mortgage industry's #1 marketing center.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 48 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 37 contacts → | ||||
Partial evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 36 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 25 contacts → | ||||
Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 25 contacts → | ||||
Strong evidence “With Volly’s Marketing Automation Suite you can more easily capture, convert, and retain customers.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 25 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 22 contacts → | ||||
Strong evidence “Paminga is a marketing automation platform built for Marketing Operations professionals, the people who actually live in the platform, not just buy it.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 20 contacts → | ||||
Strong evidence “Justuno is a website marketing automation platform designed to increase leads and revenue for thousands of businesses worldwide.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 18 contacts → | ||||
Partial evidence “With the hosted Ethofy Inspired Marketing suite, marketers have a way to recapture their time and repurpose their budget dollars.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 18 contacts → | ||||
Strong evidence “Real Magnet is a leading marketing automation platform that helps businesses attract, engage and deliver better email, marketing, social and mobile campaigns.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 18 contacts → | ||||
Indirect evidence “Halo Programs have been helping Mortgage, Real Estate, and Residential Heating and Cooling companies to cultivate customer relationships for over 50 years.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 16 contacts → | ||||
Strong evidence “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: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 15 contacts → | ||||
Strong evidence “We're building the next gen AI marketing automation platform called Singulate.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: open source marketing automation software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names open source marketing automation software companies.
- Partial evidence
- Its own public description names part of open source marketing automation software companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name open source marketing automation software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 171 open source marketing automation software companies based in the United States
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Open source marketing automation software companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
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 RevenueBase Smart Search 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 Smart Search, 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.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names open source marketing automation software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- 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 its RevenueBase Smart Search 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
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names open source marketing automation software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
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.
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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 Smart Search, 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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