Glad to see so much interaction in this thread.
Outside of that the absolute hidden gem of the Sega Saturn is a platforming/fighting/rpg game called Dark Savior, it was an unofficial sequel to Landstalker and kept the best aspects of the platforming and fighting aspects of that game, as well as being an early adopter of the 3d platformer. The game is excellent in the terms of replayability with five different parallel streams that the story can fall into depending on your early success at the beginning of the game, the best ones story line wise are parallels two, three & four.
If you own a Saturn or have access to an emulator it is definitely one to play, it was Saturn exclusive which is why its relatively unknown outside.