Dune 2 was Westwood Studios, personally I preferred the first one. Inspired me enough to go and rent a video of the movie which was also good. Odd to see Sting in a film. O.o
So many, Might and Magic I, II and III I played to death.
I spent hours playing SSI's AD&D games; eg. Champions of Krynn, Death Knights of Krynn and a zillion others.
Sierra Online produced some quite amazing games on the Amiga.
Captive from Mindscape was a gem, unique gameplay, fun bouncing the balls of the walls, lovely map designs, unlimited levels I believe as well. I always remember struggling to work out how to open the first frigging door/portal.
My favourite RPGs have always been on the Amiga never really got in the PC gaming scene, did playable Ultima Online once many years ago. For the last 5 years I've been playing a turn-based strategy game in a similar vein to all the great AD&D games mentioned above. Its called Dofus, subscription is dirt cheap about £6 a month. Probably the best online game fantasy game available on the Mac unless you have a large wallet and love 3d games like the almighty World of Warcraft. - tbh Mac isn't exactly spoilt for choice when it comes to online games.