Valve just released the source code for Team Fortress 2 — on purpose
In a post on the Team Fortress website titled “The TF2 SDK has arrived!” Valve addresses mod creators directly. “We’ve just ...
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Valve releases 'Team Fortress 2 SDK,' enabling creators to 'build completely new games based on TF2'
"Unlike the Steam Workshop or local content mods, this SDK gives mod makers the ability to change, extend or rewrite TF2, making anything from small tweaks to complete conversions possible," Valve ...