If you want to include homebrew games (as opposed to professionally released indie games), the list is almost endless... You can start with RetroGuru, they have released some of their games on the Dreamcast, mostly ported by Indiket, and Fruit'Y even had a pressed release through the DragonBox Shop (home of the Pandora and the upcoming Pyra handhelds):
http://www.retroguru.com/
https://www.dragonbox.de/en/
The homebrew stuff is a little on the grey zone, as many of those games have fallen into obscurity. I remember a homebrew community over at DC-Evolution that focused on porting games to the DC.