Avernum / Geneforge

[sevrun]

Not as active a set of games as seem to be favored around here, but they are quite engrossing none-the-less. Demo versions are free with a set cutoff perhaps 25% of the way through the games, which is more than enough to decide if you like them or not.
Just a thought, I like em enough to keep them on my backup drive which I can't say for most games.