Autograph is used for graphing and geometry, statistics and probability.
GAUSS is a mathematical and statistical programming language for doing economic and econometric research.
Geometer’s Sketchpad allows you to construct figures, diagrams and mathematics concepts, as well as complex geometrical constructions.
Maple is a computer algebra system that helps you analyse, explore, visualize, and solve mathematical problems.
Mathematica is a program and computer language for use in mathematical applications.
Matlab is a program for numerical computing which can use for modelling, data analysis, computation and engineering graphics.
MikTex is a program that allows precision typesetting that is compatible with most computers. It is particularly useful for the creation of complex mathematical formulae.
Scientific Workplace + Beamer allows you to create, edit and typeset mathematical and scientific text.
Texmaker is a Latex editor used to write well structured documents.