Top 4 Startups based in Open Source

Last verified startup: Zeal | 2026-06-02

You can find here the most popular startups (mostly tech) in Open Source. If you are a startup founder, you can add yours by submitting it on SaaSHub and filling in the "Startup Details" section. Please let us know if you think we are missing a startup - you can use the feedback button.

1. Pi-hole

Pi-hole is a multi-platform, network-wide ad blocker. It is categorized as Security & Privacy, Ad Blockers, and Threat Detection And Prevention

Startup details:

Some useful links are their website and our list of competitors and alternatives.

2. Uptime Kuma

A fancy self-hosted monitoring tool. It is categorized as Website Monitoring, Uptime Monitoring, and Monitoring Tools

Startup details:

Some useful links are their website and our list of competitors and alternatives.

3. Zeal

A free, open-source offline documentation browser that puts documentation for every major language and framework one instant search away, on Linux and Windows. It is categorized as Software Development, Developer Tools, and Documentation

Startup details:

• Employees: 1 - 9
• Released in: 2013

Some useful links are their website and our list of competitors and alternatives.

4. Revolt.chat

Don't bother with chat apps that don't respect your privacy. Revolt is a brand new chat platform designed around you. It is categorized as Communication, Live Chat, and Group Chat & Notifications

Startup details:

Some useful links are their website and our list of competitors and alternatives.

Finito

We hope that this list of startups based in Open Source was useful to you. You are more than welcome to suggest changes and feedback. Please note that the list is updated not more often than once a day. If you have made any changes to your startup through its management page, they will be reflected here after the next update within 24h.

FAQ

• How do you order the list?
  The list is ordered by popularity measured by the number of articles and mentions on reputable websites.
• How can I add my startup here?
  Easy. Just submit it on SaaSHub and fill in the "Startup Details" section.
• What if some of the details are outdated or incorrect?
  First - there is a quarterly product verification process that aims to keep all information up-to-date. Second - you are more than welcome to send us corrections and feedback.