This was my favorite thread on the old r/OSR. So is your favorite system/systems?

I’ll start:

Basic Fantasy - BF gets overlooked a lot because the print books are sold at cost so I think it ends up being a lot of peoples introduction to OSR, but I keep coming back to it. The modules are really well written.

Old School Essentials - Just got the Rules Tome and I love it, though I haven’t had the change to dig into a game with it yet.