Freeware: Quaternion

Calc 3D Pro 2.1.5Calculator for statistic, function plottting, vectors, matrices, complex numbers, coordinates, intersections. For objects like point, line, plane and sphere distances, intersections, volume, area of squeres, area of a triangle can be calculated.

Makin' Magic Fractals (MMFrac) v2.1is a command-line utility which allows you to generate 2D and 3D fractal images. The 2D mode features a number of fractal formula choices as well as a host of possible coloring options.