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Valve Releases Team Fortress 2 Full Client and Source Code

Valve has opened up Team Fortress 2's full client and source code, encouraging players to 'change, extend, or rewrite' the ...
GosuGamers

Valve releases full Team Fortress 2 source code, allows modders to run wild

Valve has officially released the full client and server code for its seminal first-person shooter Team Fortress 2 online. Fans of the game are encouraged to “change, extend or rewrite” Team Fortress ...
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 ...