DEmul - DEmul is a Sega Dreamcast emulator able to play commercial games.
Roms Mania - A working online resource for roms.
Redream - Redream is a work-in-progress Dreamcast emulator, enabling you to play your favorite Dreamcast...
ROMNation - Rom download site
RomsGet - Download Free ROMs for NES, SNES, GBA, N64, PSX, PS2, PSP, XBOX, GAMECUBE, WII, NDS and more! Works with Windows, Mac, Linux and Android.
NesterDC - NesterDC is an emulator that enables you to play Famicom and NES games.