Ok this thread is about the best emulators out there for each system, i will need some help as i cant test the, all but i will keep adding to the list:
Green indicates system being emulated.
Blue indicates the emulators being included for firmware 1.0 and 1.5
Red indicates the emulator included for 2.0
1.5 and 2.0: Snes9x TYL 0.2c The best emulator for the snes created by YoYoFr, Laxer3a, and Thunderz. It runs some games flawlessly but a few dont run very well at all.
1.5: Dgen 1.20 The best emulator for the sega genisis running on 1.5, made by Syn-Z
2.0: Dgen 1.10c This earlier version is the best available for fimrware 2.0, created by Syn-Z
Sega Master System: 1.5 and 2.0 SMS Plus 1.2: This emulator was created by Chris Swindle and features an adhoc mode so you can play multiplayer games.
Gameboy/Gameboy Colour 1.5 and 2.0 Rin 1.32: This is an emulator that plays both gameboy and gameboy colour games, made by Mr. Mirakichi
Gameboy Advance: 1.5 Only PSP GBA 1.1 This emulator only runs on 1.5 and is not full speed, made by PSP288
ScummVM: 1.5: ScummVM 0.8 for 1.5
2.0 ScummVM for 2.0 ScummVM emulates old PC games including extremely popular Lucas Arts games such as: Digg, Sam and Max, Day of the Tenticle, Broken Sword, Monkey Island, and much much more, this was made by Joost, Thomas, and Paolo
Atari Lynx 1.5 and 2.0: PLynx 0.4 This emulator runs on both 1.5 and 2.0 and is made by PLynx
Neo CD: 1.5 and 2.0: Neo CD 0.7.1 This is an emulator for the Neo CD and runs on 1.5 and 2.0 firmwares, it was made by Zelurker
NES: 1.5 and 2.0: unNesterJ r2b Made by 'e' this emulator is one of the best for the nes, it runs on firmware 1.5 and 2.0