No order:

Darius Gaiden
Rayforce
Border Down
Ketsui ~Kizuna Jigokutachi
Power Drift (simulator version)
Raiden Fighters 2
Time Crisis 3
Alien vs Predator
Street Fighter III 2nd Impact : Giant Attack
Super Street Fighter II: The New Challengers (even over Super Turbo, truthfully)
King of Fighters '98
Smash TV
Toobin'
Shinobi
After Burner (simulator version- the first $1 per credit game I know of, but worth it)