Gnuplot Central: Official website for gnuplot 4. Includes downloads, screenshots, documentation, and links to other help and tutorials

MapleSoft: Develops interactive mathematical solutions for educators and technical professionals. Features product specifications and customer support

PTC Mathcad: Technical calculation software for engineers, scientists, researchers and analysts, plus other technical software for industry and education

Sodaplay: Includes the Soda Constructor, a Java applet that animates two dimensional models made out of masses and springs

The MathWorks: Developers of MATLAB, Simulink and Stateflow. Offers products for data analysis, visualization, application development, simulation, design, and code generation