Voxigine is a voxel engine I started, initially as a way to learn modern OpenGL, though that idea fell through pretty quickly (eventually I'll convert it to use modern OpenGL though, perhaps with a blog series or something). It could be considered a currently ongoing project, albeit slow-moving while my main focus is SLADE.
So far it features infinite procedurally generated landscapes (with lua-configurable parameters), simple distance-LOD, and... not much else, yet. I also started on a simple in-engine voxel model editor however I'm undecided whether to continue with that or simply adopt an existing voxel model format.
As it is very WIP, there is currently no binary release, however the source code can be found on GitHub.