Fightcade is an online platform for retro gaming consisting of both frontend and backend parts on top of several emulators integrated with GGPO, which allows rollback-based P2P online play. In layman terms, this means that demanding games in terms of input lag and responsiveness (such as fighting games) can be played over the internet with very little perceivable lag.
Fightcade is not only about fighting games, though. It supports any game that its emulators support. This means you can play more than 7000 games on Fightcade at this time, and this number could grow in the future. It's like an online amusement arcade where you can play with or against anyone in the world, in any of your favorite retro games!