What do you want to contribute to? General kinds of things would help. I'm sure the community can help point you to a few projects so you can make a more concerted effort if one catches your fancy.

The best thing about programming is, it's all still programming. Once you get a couple languages down, you can switch it up without nearly as much headache. The API's shouldn't be feared these days, at least the popular ones. They're almost always popular because they're well documented and easy to try often as well.