this caught my eye a few months ago when I decided to learn some opengl/gamedev. Started working with it but abandoned it when I realized that opengl 2 is decade old.
Other then that it seemed a rather nice set of tools for my inexperienced eye
Although the renderer is GL 2.X based -- it supports OpenGL 3+ features using extensions. It was written against OpenGL 2.X so that the lowest OpenGL 3 hardware could be targeted.