One that's fairly popular in some of the circles I run is a game called Masks: A New Generation. As the name suggests its a game about young superheroes growing into the role. Mechanics wise its based of the Powered by the Apocalypse engine started by the titular game Apocalypse World. For those unfamiliar with them PBtA are very narrative heavy games and are light on mechanics. That's not to say that the mechanics aren't deep, but they are created in a way to further the story rather than to create tactically interesting combat. If tactical combat is something you are looking for, don't play Masks. If you are a fan of shows like Young Justice, Teen Titans, or Young Avengers this might be something for you.