Valve has announced today through their official Team Fortress 2 website and its accounts that the Team Fortress 2 SDK will be publicly released on GitHub.

In a surprising update, the SDK utilized for Team Fortress 2's client and server game mode was been officially released and made public on Valve's GitHub repository on February 18th, 2025. After the SDK leaked some time ago, games like Open Fortress and TF2 Classic made the roundups online, but due to those sourcemods using leaked versions of the SDK, these sourcemods couldn't be included in Steam as mods for the original Team Fortress 2. Now with the official SDK publicly available, these sourcemods, and others that might come around, can join the ranks of the many existing Half Life 2 sourcemods, like the popular Gmod. Once these sourcemods appear on Steam, users will be able to download and play them easily, given the player owns Team Fortress 2 of course.

​

But the updates from Valve don't stop there, as Valve has additionally updated all Source 1 multiplayer games in their library, like Team Fortress 2, Counter Strike, Deathmatch for both HL1 and HL2, to now properly support 64-bits systems, as well as adding P2P support using Steam Networking, and also adding bugfixes to those games, based on the Half Life 2: 20th Anniversary release from last year.

​

With all these new updates, and Valve's official release of the TF2 SDK, the gates have been opened for players and creators to start developing their own games based on TF2, similar to how Half Life 2 and their sourcemod games did throughout these past two decades.

Source
Source SDK on GitHub

 

[Bladexdsl]

take note nintAPPLE this is how it's done

 

[SuffahBish]

Valve remains undefeated. Best video game company.

 

[LightBeam]

They got tired of taking the blame for TF2 lol

Now let them release Classic Offensive on Steam you cowards, or are you scared that they will get some CS2 players lol

 

[ZeroFX]

nice, this is nice.

 

[LandonAndEmma]

View attachment 486711​

Valve has announced today through their official Team Fortress 2 website and its accounts that the Team Fortress 2 SDK will be publicly released on GitHub.

In a surprising update, the SDK utilized for Team Fortress 2's client and server game mode was been officially released and made public on Valve's GitHub repository on February 18th, 2025. After the SDK leaked some time ago, games like Open Fortress and TF2 Classic made the roundups online, but due to those sourcemods using leaked versions of the SDK, these sourcemods couldn't be included in Steam as mods for the original Team Fortress 2. Now with the official SDK publicly available, these sourcemods, and others that might come around, can join the ranks of the many existing Half Life 2 sourcemods, like the popular Gmod. Once these sourcemods appear on Steam, users will be able to download and play them easily, given the player owns Team Fortress 2 of course.

​

But the updates from Valve don't stop there, as Valve has additionally updated all Source 1 multiplayer games in their library, like Team Fortress 2, Counter Strike, Deathmatch for both HL1 and HL2, to now properly support 64-bits systems, as well as adding P2P support using Steam Networking, and also adding bugfixes to those games, based on the Half Life 2: 20th Anniversary release from last year.

​

With all these new updates, and Valve's official release of the TF2 SDK, the gates have been opened for players and creators to start developing their own games based on TF2, similar to how Half Life 2 and their sourcemod games did throughout these past two decades.

Source
Source SDK on GitHub

WHEN WILL THE GAME DIE?!?!

 

[AdenTheThird]

"What are you? President of his fan club or somethin'?"

"No!... That would be your MOTHER!"

 

[_Snow_]

LONG LIVE TF2!!! This is excellent news. Now Valve just needs to finish HL3 and life will be good.

 

[Mama Looigi]

with the tf2 finale comic having just been released as well, this feels like a final send off from valve

opening up the game to the community perhaps in an attempt to communicate that the game is 'complete' and will never be receiving new content again

 

[GengarsGhostlyGiggles]

worth checking out ?
I've been heavily looking into unity for game dev due to the asset store making it a breeze to make smaller indie games

 

[Kwyjor]

Ironically, they managed to break Portal a few days ago over the course of their updates.
https://www.youtube.com/live/hFmb0fbOCBQ

 

[OilFreak]

We are so back
No L4D or L4D2 updates though? There's still screen tearing on Linux

 

[Catastrophic]

Valve remains undefeated. Best video game company.

I'd be inclined to agree if they actually made video games lmao

 

[AngryCinnabon]

We're going to live forever!
- Jane "The Soldier" Doe

 

[FluffyLunamoth]

take note nintAPPLE this is how it's done

Oh yes, absolutely best game company every for introducing and pushing gambling addiction to kids at an early age. Mhm. Yep.

Also TF2 has been bot ridden for over a decade and they've done nothing about it.

They're no better than most companies, stop asspatting them as if they're special. The only thing they has is that they aren't beholden to shareholders.

Also no, it's not how it's done. This is them admitting they're done with the game, outside of security bullshit.

 

[JaNDeRPeiCH]

Well Valve its a cool company for gamers.Thinking for the best of their clients.

Nvidia sucks today about the notice of dont give support to any Physx Games for any 2025 gpu graphics card,

 

[LightBeam]

We are so back
No L4D or L4D2 updates though? There's still screen tearing on Linux

And the last update they made broke non-english voicelines. Now when I play they can talk french but suddenly yell "CHARGER" in english, feels bad.

Makes me feel like a spoil brat in some way cuz they still made a pretty good update, but broke something that worked perfectly fine and never went back to fix it

 

[smilodon]

Valve remains undefeated. Best video game company.

I love them, they provide the best loot boxes containing NFT guns you can gamble on shady website to make some crime lords rich. They wont do anything about it since it rewards them with billions per year. Best part? You can even take part in that while underage!

 

[Jayro]

Holy shit, I never thought I'd see the day.

Now bring DX11/12 support you cowards!!!

 

[Cris1997XX]

Yeah, the fucking Valve haters just had to invade this thread while we were celebrating...