Project M shouldn't be considered a "smash" game when it's not made n'or licensed by Nintendo.
Skial
Sargent¥
Meowrisa
It's widely considered one and is a viable option for tournaments and gameplay, since it is brawl but more balanced and less floaty. Plus it adds some stages and skins that are MLG.
Sargent¥
Not legit though, consider by fanbase, sure, but not legit Smash.
Deer Force
fan games are legit dude look at mega man x street fighter