Stride (formerly Xenko), a free and open-source cross-platform C# game
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Svelto ECS C# Entity Component System
Ze Text Adventure game Builder : Create as you play !
Tools and Z80 engine for creating adventure games. (RUST)
Murder is a pixel art ECS game engine
Entitas is a super fast Entity Component System (ECS) Framework
2D Game Engine
Portable game engine with main focus on point-and-click adventures