CYCAS is a 2D + 3D CAD package for drafting and design in high quality and for creating 3D presentations and technical illustrations easily. Some of its features include an easy-to-handle user˙ interface, special architectural elements and functions, a WYSIWYG display, printing, plotting, import˙ and export filters, photo realistic rendering with POV-Ray, documentation and tutorials, example˙ drawings, and an extendable 2D/3D symbols library.˙
SCI Graphics is a scientific application for data analysis and technical graphics. It fully supplies plotting features for 2D, 3D and polar charts. A Very nicely done application.˙
Scilab is a scientific software package for numerical computations. This is probably the most useful math package around, its free and it works on WINDOZE too. ( Scilab development˙ page )