Originally Posted by joxer 
GOG also added another great game, it's not RPG though:
http://www.gog.com/gamecard/clive_barkers_undying
But it does have skills that can be upgraded during the game based on your choice so in a way we can say it has RPG elements. Horror, humor, suspense, thrill, awsome story - for just 6€.
And
Omikron: The Nomad Soul!
Granted, it's been a while since I played it, but I loved every minute of it. Very intriguing setting, and good story! I can recommend it.