Xash3D Engine
GPLXash3D is the powerful independent open-sourced 3D-engine, aimed for high compatibility with GoldSource engine formats (maps, models, textures, sounds...
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Drag[en]gine
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OldSchool Library
GPLOldSchool Library (also known as OSLib), is a 2D graphics library for the Sony PSP. Created by Brunni late 2006. It uses the power of the PSP to easily...
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ProprietaryBrahma is a 3D game engine with a rather retrofuturistic design, intended for small studios and solo developers. It's being written from scratch in C...