Powerful, mature open-source cross-platform game engine for Python
A game framework written with osu! in mind.
Visual Basic 6 2D online adventure game engine
Tools and Z80 engine for creating adventure games. (RUST)
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Go 3D Game Engine
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A small text based game engine (VB.Net)
WGFX 2D Game Engine
Advanced 2D/3D(CPU,GPU) Game Engine Library