Company lists · Data refreshed September 2026
Top 25 Open source web frameworks worldwide
RevenueBase identified 161 open source web frameworks worldwide as of September 2026 and tracks 2,744 professional contacts across them, including 196 with verified work emails. The United States is the largest market and London the largest hub.
This list covers open source web frameworks worldwide, 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 20, 2026. Country and city lists for open source web frameworks follow the table.
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 web frameworks worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 102 contacts → | ||||
Strong evidence “Vaadin is the open-source Java framework for building modern web apps.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 86 contacts → | ||||
Strong evidence “SensioLabs is the creator of the Open-Source framework Symfony, which has become a global reference in web development.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 24 contacts → | ||||
Indirect evidence “Potix is a privately held software company, founded by Tom Yeh and Henri Chen, who have worked together and developed many award-winning products since the early 1990’s.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 16 contacts → | ||||
Partial evidence “From simple pilots to production-ready web applications in no time.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 14 contacts → | ||||
Indirect evidence “The best place to build, test, and discover front-end code.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 14 contacts → | ||||
Strong evidence “Spécialistes du développement Open Source (PHP, Javascript) Cloud et OPS / Associé Time For The Planet et certifié Great Place To Work” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 12 contacts → | ||||
Strong evidence “MODX is the company that backs the open source Content Management System and Web Application Framework, MODX, based in Dallas, TX, USA.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 11 contacts → | ||||
Strong evidence “SST is an open-source framework that makes it easy to build modern full-stack applications on your own infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 9 contacts → | ||||
Partial evidence “Plasmic is a visual development platform that empowers your entire team to build production-grade web apps fast, from internal tools to customer-facing products and websites.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 9 contacts → | ||||
Strong evidence “Lowdefy is an open-source low-code framework to build web apps, admin panels, internal tools, BI dashboards with ease.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 9 contacts → | ||||
Strong evidence “An open-source framework for building Web, Mobile, and Desktop applications” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 7 contacts → | ||||
Indirect evidence “ApostropheCMS was created because our agency needed a better, smoother tool that was not only easy for clients and editors but felt great to build in.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 contacts → | ||||
Indirect evidence “Hello, Dev Thank you for embarking on this journey with us to create an ambitious and exciting developer experience that is continuously improving.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 6 contacts → | ||||
Indirect evidence “Hello world!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 6 contacts → | ||||
Strong evidence “High-quality open-source software for web developers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 4 contacts → | ||||
Indirect evidence “Floodlight was started out of an industry need.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 3 contacts → | ||||
Indirect evidence “Software & Services Consultants” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 2 contacts → | ||||
Strong evidence “smallstack is a lightweight and extensible web project framework with the goal to fasten prototyping and project developing down to several days.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 2 contacts → | ||||
Strong evidence “Open source tools that redefine developer experience in the web ecosystem.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 2 contacts → | ||||
Strong evidence “Neos CMS is a modern, open-source content management system designed for both editors and developers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 contacts → | ||||
Indirect evidence “Hey there!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Partial evidence “Realizziamo progetti web versatili e performanti, grazie a strumenti in grado di garantire i migliori risultati in fase di sviluppo e mantenimento.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Partial evidence “Jasny develops high quality web applications, specializing in information retrieval, social APIs and UX.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Partial evidence “CakePHP is designed to make common web-development tasks simple, and easy.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 1 contacts → | ||||
Partial evidence “eWebDesign.co is a community that includes all the key ingredients of technology and talent to support Rapid Web Application Development.” Source: RevenueBase Database · checked Sep 20, 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 web frameworks. 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 web frameworks.
- Partial evidence
- Its own public description names part of open source web frameworks, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name open source web frameworks. 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 161 open source web frameworks worldwide
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Open source web frameworks worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 web frameworks, 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.
- Coverage
- Every country. Country and city lists for open source web frameworks are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “open source web frameworks”. 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 web frameworks), 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 web frameworks, and records with no verified work email.
- 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, 196 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 20, 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.
Open source web frameworks by location
1 lists · largest firstEvery Open source web frameworks list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 web frameworks, 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 web frameworks are there worldwide?
RevenueBase identified 161 open source web frameworks worldwide 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?
Vaadin, headquartered in Turku, tops this list with the largest team on record.
Which country has the most open source web frameworks?
The United States leads with 28 companies. Every open source web frameworks list by country and city is linked on this page.
Which city has the most open source web frameworks?
London leads with 5 headquartered companies, followed by Kolkata (4) and New York (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 196 verified decision-maker contacts tracked across these 161 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 20, 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.