For the past few years, a small team of Nintendo fans have been iterating on a mod called Project M, a revamped version of the Wii's Super Smash Bros. Brawl. The mod, which was designed to improve Nintendo's original game with an eye toward tournament play, has shut down, effective immediately.
According to the development team's website, the six-year project is ending so that they can take their skills and "move on to bigger and better ventures," presumably work on some sort of original game. Along with closing development, the team has closed out Project M's website completely, removing all information and download links, a move that serves as a reminder of the liminal lifespan of even the most beloved fan games.