[GOG.com] The Witcher free with any purchase!

If you already own it, they give you a gift code so you can give it away ;)

Good recommendations, though most GOG games are awesome to be honest. Also, for those considering a purchase, maybe wait till tomorrow as there are often weekend deals.

I'd like to add Sid Meier's Alpha Centauri to the list. It's worth it for the tech tree alone. :-)

Dungeon Keeper 2 and Dungeon Keeper Gold