Cross-platform 2D and 3D game engine
Tao3D is a programming language for real-time interactive 3D
A real time 3D graphics engine written in C++
High performance JavaScript templating engine
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
A WebGL-based 3D engine for technical visualization
3D Software Renderer in 700 Lines
A Realistic and Rich 3D Environment
Realtime 3D engine for game development
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A performant, flexible, and easy-to-use real-time 3D rendering engine
3D .NET engine for Windows, Linux, Mac
Simple voxel raycasting engine in SFML with multithreading support
A public domain cross platform 3D game
Design and Display Happy Cube solutions
A really simple (following K.I.S.S statement) ray tracing project.
PHIGS (Programmer's Hierarchical Interactive Graphics System)