Vectric Vcarve Pro 6.091 -

Even by today’s standards, the core toolset in 6.091 is surprisingly robust:

This was the soul of the software. Version 6.091 had a remarkably stable algorithm for calculating V-carving toolpaths. It handled sharp inside corners without overcuts and managed flat-bottomed areas with a pocketing routine that was surprisingly efficient for its time. Many users insisted 6.091 had a "crisper" corner calculation than later versions (though Vectric would argue later versions simply added more control). Vectric VCarve Pro 6.091