D&D Basic, AD&D 1e and 2e, Hero Systems 4e and 5e, Chivalry and Sorcery, Runequest, Dragonquest, Traveler, TORG, Psi-World, and a few others that I can't recall off the top of my head. The thing is, each system has its good and not so good features, so trying to pick a best and worst is something I tend to avoid.