This looks interesting, but be careful of the license. It is only "free for research purposes".

It stuffed with features:

  * OpenSCAD like modeler
  * with GPU support everywhere
  * various parameters for support/infill/...
    cannot only be defined for layer ranges
    but also as vector fields
  * experimental slicing features not seen anywhere else
    e.g. 'cavity': makes parts as hollow as
          possible while keeping them printable
    or 'wings': support that avoids the part itself
    or direction agnostic infill patterns,
    ...

Last time I came across IceSL I was searching for Lua code that implements operations on 3D meshes. Operations like extrude, bevel, intersect, union and so on. This project has bunch of stuff in open source but some parts are clearly missing. Maybe someone has better idea where to find such core mesh manipulation algorithms for Lua?

I'm happy to see innovation in the slicing side of 3D printing, it's going to only get better at this rate I hope.