Super Puzzle Fighter 2
Capcom Vs. SNK 2
Street Fighter III: Third Strike
Marvel Vs. Capcom 2
Ikaruga
Powerstone 2
Soul Calibur
Street Fighter Alpha III
Crazy Taxi

You can find almost all of those easily on the internet. I did, anyway. I never could get Street Fighter Alpha III to work right, though. Take a look around for the DC Fighters 3 Pack--it has Capcom vs. SNK 2, Third Strike, and Marvel vs. Capcom on one disc. Torrent them, burn them to CDs, and play 'em.