NDSEmulator - NDSEmulator is a site completely committed to certain things, and that is Nintendo DS and NDS emulators.
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.
The Iso Zone - To improve gameplay
Roms Mania - A working online resource for roms.
Romulation - Romulation provides information and downloads for classic game system emulators.
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.