Valve Officially Allowed Creation of Mods and Games Based on Team Fortress 2

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- Due to Source SDK release Full TF2 client and server game code is now available for modders.
- TF2, DoD:S, HL2:DM, CS:S, and HLDM:S now support 64-bit binary.
- Source SDK is being released on a non-commercial basis, meaning all mods created with it must remain free to play.
Valve has released a massive update to the Source SDK, allowing content creators to build completely new games based on Team Fortress 2 (TF2). From now on, modders have access to the full client and server game code of TF2.
The Source SDK is designed to let creators do much more than just tweak things. With access to the full game code, modders can change, extend, or even rewrite TF2 entirely, from tiny adjustments to fully-fledged game conversions.
It is worth mentioning that Source SDK is being released on a non-commercial basis, meaning all mods created with it must remain free to play while published TF2 mods can actually show up on the Steam Store, appearing as new games in the Steam library. While mods can’t profit off of the work created by the Steam Workshop community, Valve is keen to ensure that modders continue to respect the contributions of the original creators.
On top of that, Valve also brings a big update to all our multiplayer back-catalog Source engine titles like Day of Defeat: Source, Half-Life 2: Deathmatch, Counter-Strike: Source, and Half-Life: Source. Key improvements include 64-bit binary support, scalable HUD/UI, prediction fixes, and other optimizations.