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Valve adds "all the Team Fortress 2 client and server game code" to its Source mod tools, letting modders "build completely new games based on TF2" and publish them on Steam

Valve has just issued a massive Source SDK update giving modders access to the Team Fortress 2 game code, opening the door for them to build all-new games based on the classic FPS and publish those ...
IGN

Team Fortress 2 Modders Rejoice as Valve Releases Full Client and Server Game Code

Surprise! Valve's just released a massive update to the Source SDK, adding "all" the Team Fortress 2 client and server game code. Valve said the update lets players build entirely new games from its ...
GIGAZINE

Valve releases Team Fortress 2 game code, allowing anyone to build games based on Team Fortress 2

an SDK for the popular shooter game Team Fortress 2 (TF2). The TF2 development team claims that this will allow developers to create entirely new games based on TF2 ...
Eurogamer

Valve releases Team Fortress 2 source code, opening door to completely new fan-made games

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 ...