The most accurate z80 emulator. Has almost perfect emulation and has proper IRQ line handling (unlike most other Z80 emus). In addition to arcade emulators it is also used by Pasofami (Nintendo NES/Famicom) and DGen (Dave's Genesis/Megadrive emulator - the guy who did DTMNT and Final Burn).
GNGEO A Neo-Geo emulator for Linux. Sorry but I can't list the games that are supported here in CAESAR. It would be a huge amount of work to work out the required ROMs without CRC information in the emulator and I don't have Linux to do proper testing either!
Impact Based on PSEmuPro (a Sony Playstation Emulator), Impact emulates some of the Capcom 3D fighters from the arcade. Needs PII 450, 128MB RAM, Fast 3D Video Card.
Modeler Modeler was originally developed by Farfetch'd but later developed by Richter Belmont as well. Now discontinued in favour of adding these systems to MAME.