And while there have been several mods since Team Fortress 2 was launched in 2007, Valve has now released the game's entire source code, which may open the door to a lot of fan creations.

Team Fortress 2 maker Valve has handed over the game's full client and server code to fans, encouraging them to "change, extend or rewrite" TF2 in any non-commercial way possible. The code is now ...