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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 ...
TechSpot

Valve releases full Team Fortress 2 SDK, modders gain control over the game's code

Why it matters: Team Fortress 2 launched 17 years ago but still receives significant updates, and its player base is as healthy as ever. The latest patch fully unlocks the game's SDK, releasing ...
MMORPG

Valve Drops Full Team Fortress 2 SDK, Allowing Any Modder or Dev To Make (Free) Derivative Work

Team Fortress 2 has had its biggest update yet… by making anyone able to update it. Valve officially dropped the SDK (software development kit) for the long-beloved multiplayer shooter game for free ...
Digital Trends

Valve just released the source code for Team Fortress 2 — on purpose

Valve just released the entirety of the Team Fortress 2 client and server source code, and it wasn’t even an accident. In a post on the Team Fortress website titled “The TF2 SDK has arrived!” Valve ...