Streets of Rage 2 on the Sega Genesis is one of my all time favorite co-op games, especially in the Beat Em' Up genre. So there's little doubt that a fan made project that took more than 8 years to complete, and based on the franchise, is something that has piqued my interest.
Called Streets of Rage Remake the game encompasses characters from Streets of Rage 1, 2 and 3 as well as stages from all of the games. But this isn't a simple rip and combine, instead every sprite has been redone from scratch, every cut scene has been recreated from scratch, and not a single line of code from the original games were used. The end result is a labor of co-op love and something completely awesome for Streets of Rage fans.
The free PC game features two player local co-op play, sadly a planned online mode had to be scrapped. You can find out more info and download it right here.