DualShockers

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

Alex Co has been writing about games for 15 years and running, and is a huge fan of online shooters and anything horror related. Valve releases TF2 SDK to the public for modders, allowing changes ...
Engadget

Valve hands the Team Fortress 2 source code to modders

Valve is handing Team Fortress 2 modders the keys to the kingdom, as long as they don't try to make any money from it. The company has added the client and server game code to the Source software ...
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 ...

Valve releases 'Team Fortress 2 SDK,' enabling creators to 'build completely new games based on TF2'

It took almost 20 years, but Team Fortress 2, the team-based FPS that changed a great many lives when it debuted in 2007, now ...