I see that people are talking about the Crusader Series. That is a big Yes for me, great games that wont run in Windows.
Noctropolis is a big Yes! Another Great Game.
I was speaking with Jason Ely (lead programmer on Crusader) about porting the games to Windows. He was going to send me the only known prototype of the next Crusader game that was going to be released (No Survivors/No Mercy), which included a multiplayer component. He would convert it to Windows usage, along with No Remorse/No Regret. I haven't heard anything back on the status, but it's likely he hasn't worked on it, since he moved to Prague since then.
That said, I hope they get on GOG!
(I can provide the soundtrack, icons, high quality wallpapers, design documents, everything.)