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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 ...

Valve has released the Team Fortress 2 SDK, which means we can expect a load of new content from the modding community.

Valve releases TF2 SDK to the public for modders, allowing changes ranging from tweaks to complete conversions. Modders can ...
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 ...