From a quick scan of the manual, I can't imagine why anyone would use this instead of MetaPost. You might need to write some macros to generate conic sections, but that would be easy enough. Am I missing a killer feature?
Otherwise, nope, this thing doesn’t have too many features. Looks like someone’s little hobby project.
What I’d like to see out of a project like this is an interactive JavaScript version, where I can drag around points and see how the whole figure reacts.
