I myself play(and use for emulation):
NES - Nestopia
SNES - ZSNES
Genesis/MegaDrive - GENS
NeoGeo - NeoRage
Arcade Machines - MAME (I use WinKawaks for CPS emulation...runs like a DREAM)
Pinball Machines - Visual PinMAME
Yes there is a pinball machine emulator
A couple games I would recomend:
NES - well ALOT
SNES - Also ALOT but there are a couple that didnt come out here and that have been translated: Seiken Densetsu 3 (Secret of Mana 2!), Front Mission (Cool Strategy RPG), Bahamut Lagoon (A Square Pokemonesque RPG), Magin Tensei 1&2 (Adult Pokemonesque RPG with demons), Mario RPG! (didnt come out in europe i think... definetly not in germany) Also a couple games that alot of people dont know about but that rock: e.V.o. (Enix RPG Jump&Run Evolution game...cool!), Teakwondo (realistic fighting game... sadly only in korean and japanese without translation), Captain Tsubasa (Strategy-RPGesque Soccer game... very bad translation available)
There are alot more cool/unknown SNES games but itd take forever to list them all
Genesis - Gunstar Heroes(very cool Probotector/Contra type game... better in my opinion), Starflight, ECCO the Dolphin!, and of course the one and only Herzog Zwei... father of all RTS games
NeoGeo - Samurai Showdown Series, King of Fighters Series (95' - 2004), Metalslug series
Arcade - lots... I'll just name a couple CPS2 games: Capcom vs Marvel, Gigawing, Super Puzzle Fighter
I spoke to Tai about this and she said its ok but DO NOT LIST ANY EMULATION SITES because it pretty much counts as warez


















