I’ve played around with a decent tool for simulating G-Code paths with cut simulation etc. It’s a bit limited by the types of tools it can support (for instance it doesn’t really handle our rounding/filleting tools), but it handles most of the common bits (cylindrical, conical, ball nose). It seems to be using voxels and a marching cubes algorithm to do all of its simulation, so it ends up creating way too many vertices and points, but overall it’s a pretty awesome tool.
I’ve tested PCB mill G-Code on it before and it looks good.
The basic interface:
Exported STL of the result (notice the number of vertices and faces!)
Running the dominoes tutorial (skipping rounding tools and some other problems)