Team Fortress 2: the highly coveted sequel to Team Fortress Classic; is a team-based source project. It is a team-based and classed base hero shooter, featuring 9 different classes that all have their own personalities, backstories, and lore. The game is free to play and is one of the oldest games still popular today. The game still technically gets support from Valve. But mainly it is just cosmetics updates that primarily feature community-made items, pretty good game.