Nintendo
FCE Ultra My personal and many other people's choise for NES emulator. It offers all features you'd want and nice graphics when configured correctly.
Nestopia The still going strong old Nestopia is many people's choise for NES emu.
Playstation
ePSXe If you're the person that prefers enhanced graphics (better than the real console). You have to get used to the configuration of this emulator though to get most out of it. I'm personally favoring ePSXe a lot.
pSX For people that wants accurate PSX emulation.
Nintendo 64
Project64 Without doubt the best N64 emu. Has a newer better version available for donators. But the public one also works very nicely.
Sega
Gens/
Gens32 Are probably among best choises for Genesis/Sega Mega drive/32x and SegaCD. Gens32 is a more updated version and is recommended to check out for people with a bit newer hardware and for working SegaCD save state support.
Kega Fusion Is also just as good if not better than Gens for same platforms.
SSF Is the best choise for Saturn emulation. Has great performance due to dynarec emulation support.
nullDC Recently released and already with the initial release it plays most games just fine and at full speed on decent hardware! Check out the wild and very active
screenshot thread!
Playstation 2
PCSX2 The impossible made possible, this emulator is actually capable of
running quite a lot PS2 games but you still need very powerful hardware such as dual core CPU (AMD Athlon X2 / Opteron or Intel Core 2 Duo) and a decent gfx card if you prefer enjoyable speeds in 3D games. Check out the
screenshot thread for many nice screenshots and info.
Gamecube
Dolphin is the biggest hope in Gamecube emulation right now which has a bright future thanks to
recent improvements. Expect a dual core CPU and 64bit OS to be required in near future if you want to be able to play games at good framerates though.
EDIT: JKKDARK beat me to it as I wrote a little more detailed list.
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Last edited by RPGW1ZaRD; April 7th, 2007 at 18:19..