Godot
Full game engineOpen source
A complete, MIT-licensed 2D and 3D engine with its own editor and scripting language (GDScript), plus C#. Exports to desktop, mobile, and the web.
Official siteReach for it when
- Games that may ship beyond the browser
- Developers who want a full editor with no license fees
Worth knowing
Web export works for GDScript projects; Godot 4 can't export C# projects to the web, and threaded web builds need cross-origin isolation headers.