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.”
Posted from: this blog via Microsoft Power Automate.