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s&box
Modern game engine built on Source 2 from the creators of Garry's Mod
paid TBD, Steam release April 2026 Solo-dev friendly
s&box is a game creation platform by Facepunch Studios, built on Valve's Source 2 engine with a modern C# API. It includes a scene editor, Hammer level editor, visual scripting, and a cloud asset library. Source code is open under MIT, and games can be exported as standalone Steam titles royalty-free.
Highlights
- + Built on Valve's Source 2 engine with modern C# scripting and hotloading
- + Full editor suite including scene editor, Hammer, and visual scripting
- + Export standalone Steam titles royalty-free
- + Play Fund revenue model lets creators earn from player engagement
Limitations
- − Still in early access — full release expected April 2026
- − Underlying Source 2 engine code is proprietary despite MIT game code
- − Smaller ecosystem compared to established engines like Godot or Unity
Platforms
Windows