Valve adds "all the Team Fortress 2 client and server game code" to its Source mod tools, letting modders "build completely new games based on TF2" and publish the…

Valve has just issued a massive Source SDK update giving modders access to the Team Fortress 2 game code, opening the door ...
The Escapist

Garry’s Mod successor s&box goes open source to aid with development

The spiritual successor to Garry’s Mod, S&box, is being made open source by the developers over at Facepunch Studios. It’s a slightly odd move for a games studio to do with an actively in-development ...
GamesRadar+

Valve adds "all the Team Fortress 2 client and server game code" to its Source mod tools, letting modders "build completely new games based on TF2" and publish them on Steam

"We're already preparing for the porting efforts and a potential Steam release now that we've been legally enabled to pursue that," according to one mod dev When you purchase through links on our site ...