57 Open Source companies in United States

57 Open Source companies in United States with 114 founders and decision-makers, led by San Francisco. 75 verified founder emails. Updated 2026-10-03.

Key findings

• FindMeMail tracks 57 Open Source companies in United States, with 114 founders and decision-makers listed.
• San Francisco is the top city, with 18 of them (32%), followed by New York (6).
• The most common team size is 1-10 employees (84% of companies).
• 5 (9%) were founded in the last three years.
• 16 have a recorded funding round; the most common is Seed (8).
• 42 companies (74%) have at least one verified founder email, 75 verified emails in total.

Breakdown

Top cities

• San Francisco: 18 (32%)
• New York: 6 (11%)
• Wilmington: 3 (5%)
• San Mateo: 2 (4%)
• Austin: 2 (4%)
• Jersey City: 2 (4%)
• Los Angeles: 2 (4%)
• Boston: 2 (4%)

Team size (employees)

• 1-10: 48 (84%)
• 501-1000: 3 (5%)
• 11-50: 2 (4%)
• 101-250: 2 (4%)
• 51-100: 1 (2%)
• 1001-5000: 1 (2%)

Latest funding round

• Seed: 8 (14%)
• Pre-Seed: 5 (9%)
• Angel: 1 (2%)
• Corporate Round: 1 (2%)
• Venture - Series Unknown: 1 (2%)

Founded (last 10 years)

• 2017: 3 (5%)
• 2018: 1 (2%)
• 2019: 3 (5%)
• 2020: 1 (2%)
• 2021: 2 (4%)
• 2022: 4 (7%)
• 2023: 5 (9%)
• 2024: 1 (2%)
• 2025: 4 (7%)

Recently added Open Source companies in United States

• Kolosal — Wilmington, United States: Kolosal runs and manages large language models locally using a lightweight, open-source platform.
• Portal VR — Campbell, United States: Portal VR offers OpenXR and virtual reality experiences to handheld mobile devices with no code changes.
• OpenCoreOS — New York, United States: Review:OpenCoreOS develops open source core banking software and tools for digital financial services providers.
• Typesense — Houston, United States: Open source, typo tolerant search engine that delivers fast & relevant results out-of-the-box.
• Learndash — Ann Arbor, United States: LearnDash provide practical and experience driven guidance for individuals and organizations interested in setting up online courses.
• NATS — San Francisco, United States: NATS is a simple, flexible, and secure high performance messaging solution.
• Trino Software Foundation — San Francisco, United States: Open source distributed SQL query engine for running interactive and ETL queries against multiple data sources.
• DDEV — Denver, United States: DDEV is a PHP development environment for web developers.
• WiseMapping — San Mateo, United States: WiseMapping is an online mind mapping editor for individuals and business.
• Khoj — San Francisco, United States: Khoj is the open-source, AI second brain. Get answers from your notes, documents, and the internet.
• ODK — San Diego, United States: ODK lets you build powerful forms to collect the data you need wherever it is.
• Read the Docs — Portland, United States: Read the Docs focuses on writing high quality documentations in reStructuredText and Markdown specifications.
• BeagleBoard — Richardson, United States: BeagleBoard promotes and motivates open-source development on OMAP-based systems.
• NumFOCUS — Austin, United States: NumFOCUS is a 501(c)(3) nonprofit that supports and promotes world-class, innovative, open source scientific software.
• GravityKit — Cape Canaveral, United States: The leading provider of powerful, user-friendly add-ons that enhance and extend Gravity Forms, the most popular form plugin for WordPress.
• PortableApps.com — New York, United States: PortableApps develops portable media-related packaged software and applications for its clients.
• EndeavourOS — Port Orford, United States: EndeavourOS is a software company that develops open-source systems.
• Infinite Retry Labs — Boston, United States: Infinite Retry Labs develops an educational app for children focused on interactive learning and scientific exploration.
• MORE Technologies — Fayetteville, United States: We're making STEM accessible through robotics
• Ukama — Pleasanton, United States: Cellular network built for you, by you
• Ceph — Los Angeles, United States: Ceph provides an open-source distributed storage system, offering object, block, and file storage in a unified system.
• Plone — Fortville, United States: Plone, a CMS solution built with Python, is among the top 2% of all open source projects worldwide
• Anyscale — San Francisco, United States: Anyscale accelerates the development and productionization of any AI app, on any cloud, at any scale.
• Embrace — Los Angeles, United States: Embrace provides user-focused observability for mobile and web applications powered by OpenTelemetry, helping teams optimize performance and reliability.
• Together AI — San Francisco, United States: Together AI is a cloud-based platform designed for constructing open-source generative AI and infrastructure for developing AI models.
• Kong — San Francisco, United States: Kong is a cloud-native platform that powers API-led connectivity for developer productivity, automating security, and microservices.
• Grafana Labs — New York, United States: Grafana Labs is an open-source software platform built to support monitoring, visualization, and metric analytics.
• Mozilla — Mountain View, United States: Mozilla provides internet solutions and offers firefox, thunderbird, and raindrop.
• Redis — San Francisco, United States: Redis is the world’s fastest data platform.
• Lyzr — Jersey City, United States: Lyzr AI provides Agentic OS, an enterprise GPT solution for customer support, procurement, HR, and marketing. It builds reliable, private, and self-learning AI…

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Frequently asked questions

How many Open Source companies in United States are there?

FindMeMail currently lists 57 Open Source companies in United States with at least one founder or decision-maker identified. The count updates daily as new companies are added.

Where are most Open Source companies in United States based?

San Francisco (18), New York (6), Wilmington (3).

How do I contact founders of Open Source companies in United States?

75 verified founder emails are available for these companies on FindMeMail. Create a free account to get 50 free reveals, then buy one-time credit packs from $12.

Related reports

• Software companies in United States (3,675)
• Artificial Intelligence (AI) companies in United States (2,382)
• Seed-stage startups in United States (1,905)
• Information Technology companies in United States (1,861)
• Health Care companies in United States (1,647)
• E-Commerce companies in United States (1,545)
• SaaS companies in United States (1,304)
• Pre-seed startups in United States (1,096)
• Financial Services companies in United States (1,062)
• Manufacturing companies in United States (959)
• Consulting companies in United States (949)
• Internet companies in United States (824)

Methodology: counts include companies in the FindMeMail database with at least one identified founder or decision-maker. Data refreshes automatically as new companies are added.