Tobari Architect has just released v2 of their Mathsurf library, a maxscript plugin for mathematical geometry in 3ds Max.  This new version adds significant performance improvements, as well as support for curves anad implicit surfaces.  Also, this new version comes with three new tools : Mathdeform, Mathcurve, and Implicit Surfaces.

The plugin suite can be freely downloaded from their site.

Torabi Architect.