MathTools

• Scilab

Scilab is a scientific software package for numerical computations providing a powerful open computing environment for engineering and scientific applications.

Scilab is an open source software.

• LaTeX Editor, called later LEd

LaTeX Editor, called later LEd, is an environment for rapid TeX and LaTeX document development. It is free to use, however, donations act as a catalyst for its develompent.

• Texmaker

Texmaker is a free LaTeX editor, that integrates many tools needed to develop documents with LaTeX, in just one application.
Texmaker runs on unix, macosx and windows systems and is released under the GPL license .