Facepunch Studios, the developers behind Rust and Garry's Mod, launched a Steam page for s&box, a game creation platform built on the Source 2 engine.
Described as a "spiritual successor to Garry's Mod," this game engine and platform lets you make games easily with an intuitive Scene/GameObject/Component system and C#.
Facepunch
Facepunch
Facepunch
s&box has been in development for several years now, and players have previously shown their progress with it in fan-made Team Fortress 2 and Counter-Strike remakes.
s&box is a pretty powerful platform for game creation. It doesn't have a formal release date yet, and it's not clear how much it will cost, but you can wishlist it on Steam so you never miss the news.