I don't think that such a service exists, but you can still do some of that. Pick any open source project you like, hang out on their tracker and IRC channel an

I don't think that such a service exists, but you can still do some of that. Pick any open source project you like, hang out on their tracker and IRC channel and answer questions. You might not have the permissions required to actually close issues, but you can certainly do some grunt work: Try to reproduce an issue, give concise description in a comment, create a PR with a test case etc. IRC channels are a good place to start if you know a little about the usage, but not much about the actual code: Answer beginner level questions first. For any moderately complex project there's always tons of these. And when you feel confident, move forward to more complicated ones. It's a great way to learn.