ThanCad is a 2dimensional cad, with limited 3d support and raster inclusion capability and emphasis in engineering. It is being written in Python and since it uses the Tkinter library, it is platform independent.
EngLab is a cross-compile mathematical platform with a C like syntax to be used by both engineers and users with small programming knowledge. It also enables the user and community to easily compile their own functions as shared objects.
Matlab, Maple and C/C++ applications of Linear Algebra in many domains, including curves in many dimensions, Cryptography and Chaos etc.