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Voxel game engine in C++ with OpenGL
3D and 2D game engine written in Rust
A game engine with an emphasis on real-time cutting-edge solutions
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
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Mahasona engine is an open source game engine.
XNA based game engine completely written in c#
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