THERE ARE NO FUNCTIONAL VITA, (SOME PS3, XBOX 360, WII U and 3DS RETAIL GAMES), PS4 OR XBONE EMULATORS[]
Accurate emulators might be less user friendly, or be difficult to set up. For that reason, there are two recommendations, one for more general use, and another one for accuracy.
For a list of emulators from every system, go here.
Multi-System[]
DOS[]
MSX[]
Famicom (NES)[]
General: Nestopia
Accuracy: Mesen, puNES or Nintedulator
Game Boy/Color[]
Arcade and Neo Geo[]
General: Final Burn Alpha
Accuracy: MAME
Super Famicom (SNES)[]
General: Snes9x
Accuracy: higan (formerly bsnes)
Master System/Genesis[]
General: Kega Fusion
Accuracy: Exodus
PC Engine (TurboGrafx-16)[]
General: Ootake
Accuracy: Mednafen
PlayStation[]
General: PCSX-Reloaded
Sega Saturn[]
Nintendo 64[]
General: Project64
Accuracy: Mupen64Plus
Game Boy Advance[]
Dreamcast[]
GameCube/Wii[]
PlayStation 2[]
Nintendo DS[]
PSP[]
PlayStation 3[]
RPCS3 (Highly experimental)
Xbox 360[]
Xenia (Highly experimental)
3DS[]
Citra (Highly experimental)
WiiU[]
Cemu (Highly experimental)