Rogue Wave Software (Popularity: )
http://www.roguewave.com Provider of a wide-range of components for the cross-platform C++ market including mathematical, financial and statistical class libraries.
S&S Software (Popularity: )
http://www.sssoftware.com/ S&S Software publishes the original Math Skill Builders series of programs for children and adults learning basic arithmetic skills. Visit ...
Systat Software Inc. (Popularity: )
http://www.systat.com/ Offers programs for interpreting statistical data, curve fitting and signal analysis. Includes support links and product information.
Ziena Optimization Inc. (Popularity: )
http://ziena.com/ Nonlinear (NLP) solver with interfaces to most modeling languages. Consulting for problem formulation and training are also available.