Valve just released the source code for Team Fortress 2

Valve says you’re now free to build your own games atop Team Fortress 2.
Valve: > 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. > The SDK is licensed to users on a non-commercial basis,
Valve just released the source code for Team Fortress 2 — on purpose
Valve just released the full client and game source code for Team Fortress 2, opening wild possibilities for the modding community.The Latest Tech News, Delivered to Your Inbox
With The Team Fortress 2 Source Code Release, Players Fear Valve Has Abandoned Game
An official blog post from Team Fortress 2 has announced the full release of the game's source code. Given the game's industry-defying longevity and especially-creative fanbase, it's likely we'll see an explosion of innovation from players in the months to come.
Valve hands the Team Fortress 2 source code to modders
Valve is handing Team Fortress 2 modders the keys to the kingdom, as long as they don't try to make any money from it. The company has added the client and server game code to the Source software development kit (SDK),
Team Fortress 2's Source Code Is Out, Fan-Made Games May Be Next
After nearly 18 years since its release, Valve is sharing Team Fortress 2's source code to allow players to remake the game anyway they see fit.
Valve releases full Team Fortress 2 source code, allows modders to run wild
Games giant Valve might be winding down development on Team Fortress 2 for good. The developer of Portal 2, Half-Life: Alyx, and occasionally, Dota 2, has released a huge update to the Source Software Development Kit.
Team Fortress 2 SDK Released By Valve
Valve has released the Team Fortress 2 SDK, which means we can expect a load of new content from the modding community.
Valve Releases Team Fortress 2 Full Client and Source Code
Following a long line of community-driven, fan-focused updates, Valve releases the full client and server code of Team Fortress 2 online.
Valve releases Team Fortress 2 source code, opening door to completely new fan-made games
Team Fortress 2 maker Valve has handed over the game's full client and server code to fans, encouraging them to "change, extend or rewrite" TF2 in any non-commercial way possible.
Team Fortress 2 Modders Rejoice as Valve Releases Full Client and Server Game Code
Surprise! Valve's just released a massive update to the Source SDK, adding "all" the Team Fortress 2 client and server game code. More like this Valve Finally Fixes BLU Scout’s Pants, 17 Years After Team Fortress 2 Came Out,
Valve ensures Team Fortress 2’s immortality with major changes
Team Fortress 2 has gotten a major update, as Valve opens up the modding scene even further to allow total overhauls to the game.
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Valve is finally putting Team Fortress 2 in the hands of fans. Players received source code for the popular shooter
Do it yourself,” is how Team Fortress 2 players read Valve's recent decision to put the free-to-play FPS's official developer ...
‘Mod makers, rejoice’: Valve shadow drops TF2 SDK to players’ delight
In typical fashion, Valve just made the Team Fortress 2 client and server game code public without much fanfare. However, this move has the potential to make a huge impact on the 17-year-old ...