There are 2 repositories under 3d-rendering-engine topic.
3D graphics renderer made from scratch using the C programming language.
DirectX11 based real time 3D rendering engine
A vulkan renderer being made to study computer graphics
game engine
3D Rendering Engine written in Java
3D Renderer and Engine Made With Python
A 3D rasterization renderer that can output images or a live window, features include: light sources, cube objects, basic shader algorithm. Self contained math library with vectors and 3x3 matrices.
A (not very performant) 3D renderer made in Python.