vNES - Nitendo Emulator for J2ME 

the fastest and best NES emulator for Java J2ME mobiles. It is fastest - With instructions optimizing, it can be even run smoothly in J2ME(java in mobiles). It is best - It supports perfect sound(for symbian,smartphone) and most roms. .
nintendo cell phone emulator java j2me

vNES - Nitendo Emulator for Symbian 

the fastest and best NES emulator for mobiles. It is fastest - With instructions optimizing, it can be even run smoothly in J2ME(java in mobiles). It is best - It supports perfect sound(for symbian,smartphone) and most roms. .
nintendo cell phone emulator symbian

RomCenter 

Universal rom manager. It takes care of your roms, audits and fixes them to get perfect games files to play with your emulators. More than 60000 games can be fixed. All consoles, arcade, computers and handheld are available.
rom emulators games mame snes genesis gameboy arcade emulation cps2 cps1 n64 datafiles