Not great. Git and then GitHub ate their lunch and then they ended up so desperate they did this: https://www.reddit.com/r/OutOfTheLoop/comments/3aajjs/what_i...

So that pretty much caused whoever still used it to stop. They sold to a new company who stopped that practice but I can’t think of many projects that want a managed SCM that felt there was any reason to switch to sourceforge from GitHub or gitlab after that, which is where most projects have ended up one way or another.

Their new owners now call sourceforge a place for “business software” which seems like hopefully the final stage which will bring sourceforge’s long slow decline to its end.

Edit: it looks like their latest owner (2020) is slashdot. So. I guess they will capably oversee its continued slide to irrelevance.