Well the original is just one game.
You should check out LavaLit's Dreamcast section for BOR mods.
I'm pretty sure this has been asked before, so here's a quick rundown.
System/App -> Best version/port
* Excellent
NES -> NesterDC (either "7.x" or "SE")
Sega Genesis -> GenesisPlusDc (blackaura)
Sega Master/Game Gear -> SMSPlus DC
Neo-Geo (Cd-Rom) -> NEO4All
Neo-Geo (Cartridge) -> AES4All
Doom I/II/Final -> Doom for Dreamcast
Quake -> NxMakaqu
* Worth trying
SNES -> DreamSNES
PC Engine/TurboGrafx-16 -> PCECast
* Apps
VCD Player -> VC/DC
Misc Video Player -> DCPlaya (override)
VMU Utility -> Dream Explorer
Also, the Dreamcast.es collection here is worth downloading.
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