So if I understand you correctly, you are looking to contribute to some open source project?
I would advise you to go at it from the opposite direction; look for stuff you want to use, specially if it's not all that well known or relatively new, and just start using it. Sooner or later you'll find yourself wishing there was some feature, or even find a bug.
It's much easier to implement something you actually want than to go out looking for stuff you could implement for the sake of contributing.
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So if I understand you correctly, you are looking to contribute to some open source project?
I would advise you to go at it from the opposite direction; look for stuff you want to use, specially if it's not all that well known or relatively new, and just start using it. Sooner or later you'll find yourself wishing there was some feature, or even find a bug.
It's much easier to implement something you actually want than to go out looking for stuff you could implement for the sake of contributing.