Just finished up A Keep on the Borderlands campaign running in White Box FMAG, real old school!
Playing Star Trek Adventures right now, with my brother GMing. He absolutely loves the game, and this is our third campaign. Love the game, but holy smokes the main book is badly organized.
Once that's done, it's my turn to GM, and my daughter wants a magic school game, so we're going to do Kids on Brooms.