www.theoldcomputer.com

Ones I have personally used and endorse (will play most games at full speed with sufficient hardware) will be marked by an * (asterisk). For more emulators and systems go to: my main thread
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*Dolphin: Great compatibility, also plays Wii roms if you have a very good system.

-SuperGCube: a continuation of the GCube project. Plays some games alright, but at this point I cannot recommend it over Dolphin.