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The original was posted on /r/opensource by /u/lewisbuildsai_ on 2025-01-24 13:03:54+00:00.

Hey r/opensource

I’m mapping out where open source is successfully competing with major commercial players ($1B+ valuation/revenue).

Cal vs Calendly is a great example. Documenso is also another good example, they’re building an OSS alternative to DocuSign ($18B).

What other open source projects are meaningfully competing in big markets?

I’m building an open source alternative to Drata / Vanta (combined $5B valuation) so it would be cool to see who else is doing the same.

this is what I’m working on if you want to check it out