I find discoverability a problem totally apart from supporting/contributing/funding. Just even finding projects is awful. Google (and other general purpose search engines) is a disaster. They serve up obviously hacked websites before a GitHub page. GitHub's search is better, but it's hard to use. I highly recommend doing a really braindead naive search on github.com, then choosing the code tab, then filtering for Markdown. Now you're searching READMEs. I've found a ton of amazing projects this way that I had no other path to without knowing their specific README language beforehand.
Edit: also if you're using a regular ass search engine (or GH), just type "awesome [whatever topic/language/platform]" and unless your area of interest is insanely esoteric you're probably gonna find some stuff you wish you knew about, because some nerd maintains an "awesome" list for basically everything used by more than 3 people.
Edit: also if you're using a regular ass search engine (or GH), just type "awesome [whatever topic/language/platform]" and unless your area of interest is insanely esoteric you're probably gonna find some stuff you wish you knew about, because some nerd maintains an "awesome" list for basically everything used by more than 3 people.