https://beta.icons.gg/
Official Early Access release is July 12th.
Yeah, I've been enjoying the hell out of this. It's a blast to play, the netcode is great, and the F2P systems seem well implemented so far. Characters and cosmetics will be unlockable by playing, or you can pay $25 for immediate access to all fighters present and future.
Highly recommended it to anyone who's ever enjoyed Smash, or wants to see what the fuss is about without commitment. I think it already plays better than most of them, especially online. (/leaner thread for new boards)