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The original was posted on /r/opensource by /u/switchback-tech on 2025-11-26 13:26:16+00:00.
We’ve all seen plenty of open-source libraries and smaller utilities.
Those codebases are quite different from production apps that have all the things:
- billing
- feature flags
- CI flows
- schemas & migrations
- APIs
- component libraries
- e2e tests
- cli
- doc site
- shared utilities
- etc
I think the Excalidraw, Cal, and Posthog repos are well-structured, for example.
But there’s gotta be more good ones.
Any repos you’d recommend I check out?
(Trying to build some good mental models as my open-source calendar app grows to avoid some pain)