Valve releases the Team Fortress 2 SDK with the game's source code, allowing users to build new games based on Team Fortress 2, licensed for non-commercial use (Andy Chalk/PC Gamer) 19-02-2025

Andy Chalk / PC Gamer:
Valve releases the Team Fortress 2 SDK with the game’s source code, allowing users to build new games based on Team Fortress 2, licensed for non-commercial use — Valve has also released major updates to all Source-engine multiplayer games adding 64-bit support, scalable HUDS, “and a lot of other improvements.”