Retrostic - Free ROMs download for GB, GBC, GBA, NDS, N64, NES, SNES, Sega, Atari and more. No hidden viruses, just download your ROM and ISO files and play them using an emulator.
KillerRoms - Download free Video Games ISOsa nd ROMs!
Roms Mania - A working online resource for roms.
CoolROM - Download from the largest and cleanest ROMs and emulators resource on the net. Mobile optimized. Systems include N64, GBA, SNES, NDS, GBC, NES, MAME, PSX, Gamecube and more.
ROMNation - Rom download site
CDRomance - Emerging retro gaming website, offering roms, isos, games for mostly old CD based console systems.