I have some spare time at my disposal and am looking to contribute to open source projects. I am not really sure where to start. I've browsed through the "Explore Github" trending section, but I haven't had much luck finding anything that I would be best suited to offer whatever I might be able to.
I largely specialize in C and JavaScript (especially node.js), but I also suffer a little from imposter syndrome and I think this would help me combat that some, and to learn and grow and improve.
Why not? Not to be a jerk, but try googling "how to start contributing to open source" and maybe even read the ask hn archives because your question gets asked a lot. I'll be glad to help you after you've done this basic groundwork yourself, then describe what you have tried so far, what your hangups are and exactly what you need help with.