I am slowly making my way in to the 21st century, and have got myself a GitHub account!
The great thing about being a late adopter is that when you pick something up, it tends to be easy to understand and work well and all that kind of thing. On the other hand, you look a bit foolish when you excitedly tell everyone about it. Oh well. So, it does seem to be everything SourceForge should have been. It's not clear to me exactly why it's taken over that space and thrived, but I've not been paying attention there for a decade, so perhaps it's obvious to anyone who has watched.
Still, yay. Now I just need to do stuff to fill it with.