Old-school 2D game engine
SDL based generic 2D game engine
A free 3D game engine to create games and realtimes scenes for Windows
2D Game Engine
Built to be ease of use, with no programming knowledge, Multi-platform
A 2D tile map editor created using .NET framework.
A retro style video game engine for RPGs and adventure games.
Cross-platform 2D game engine
Delphi-like IDE for cross-platform game development
Pokemon project made in vb.net with 2D version.