I always felt a little sorry for Fortress Forever [official site]. The folks behind the Source engine mod started in the long period when Valve had seemingly abandoned Team Fortress 2, with the goal of recreating Team Fortress Classic-y style class-based shooty shenanigans on a newer engine. Then Valve unexpectedly re-announced TF2, and Fortress Forever only beat it to release by one month before attention flocked to Valve’s shiny new thing.
Fortress Forever is a pretty dang different game, though, especially after years of Valve bolting new things onto TF2. If you fancy some good old-fashioned 2forting, it’s easier than ever, as the latest FF update brought it to Steam as a free standalone.