Plot data, graph functions, and evaluate data
A search engine for computations: gives answers to factual questions, rather than a list of webpages and links. Try searching an equation, a type of function, or even a person.
Koval's 3D Grapher
A tool to perform many types of computations, functions, graphing, and matrices.
A program designed to help visualize the structure of finite groups
Free programming software for statistical computing and graphics. Useful for statistical data analysis.
An object-oriented program, and one of the most influential. According to opensourceforu.com, Java:
General purpose programming language, well used at Hamphshire.