Slith'zerikai, [@NowIGiveUp]. It came from a very, very old game released back in '95. I played it when I was a kid, and only a few years ago the complete trilogy came out as freeware and the source code has been released as well. Point and click sort of fantasy adventure with a lot of really great story telling and well done tactical turn-based combat.

It has since been redone for younger gamers to see in all new isometric glory.

Exile, now known as Avernum. They've already rebooted their first two Exile games, and I'm pretty sure the third will be coming out soon enough.