Valve has quietly released the Team Fortress 2 client and server game code to the public, integrating it into the Source SDK (Software Development Kit). This significant update essentially makes the 17-year-old free-to-play shooter nearly open-source.

The update enables content creators to develop completely new games based on TF2's framework. More importantly, existing mods like Team Fortress 2 Classic and Open Fortress, which previously operated using leaked Source files, can now officially release on Steam.

Key features of the SDK release:

• Mods can be published directly on Steam Store
• New TF2-based games will appear in Steam's game list
• Players can potentially access their TF2 inventory in mods
• Valve requests mod makers to respect Workshop contributors' content

Additionally, TF2 received an update addressing various graphical improvements and technical issues. This release marks a new chapter for the TF2 community, opening up possibilities for creative expansion and official mod support.

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