PC:
Streets of Rage Remake (the best SoR game ever )
Beats of Rage
Super Mario War
Mugen (I need to find a good one)
Heads up on SOR:R - if you are using an IPAC2 on your cab and you have a six-button layout that is set to MAME's P1 default (L_CTRL, L_ALT, SPACE, L_SHIFT, Z, X), you will run into issues with this game as it is hard-coded to terminate on keypress ALT-X. Bummer, as it really is a stellar game!