Comment by Brian_K_White

And the forks network display.

Find a project, find out if it's the original or a fork, and either way, find all the other possibly more relevant forks. Maybe the original is actually derelict but 2 others are current. Or just forks with significant different features, etc. Find all the oddball individual small fixes or hacks, so even if you don't want to use someone's fork you may still like to pluck the one change they made to theirs.

I was going to also say the search but probably that can be had about the same just in regular google, at least for searching project names and docs to find the simple existence of projects. But maybe the code search is still only within github.