Ask HN: A good open-source community to contribute to

It's Google Summer Of Code season again. https://summerofcode.withgoogle.com/

Larger open-source communities publish project ideas. Those communities are usually somewhat organized because they need to prepare months ahead, assign mentors, got vetted by Google.

I'm biased so I point you to https://wiki.openstreetmap.org/wiki/Google_Summer_of_Code/20... and https://www.hotosm.org/get-involved

Can you be more precise, what are your interests? Skills? It's hard to answer such generic question, at least I struggle to come up with anything meaningful.