PSU Mark
Eberly College of Science Mathematics Department

Commercial Math Sites

See also this list of publishers.

Academic Press
Aces Research, Inc. (Developers of Mathematics Library Plus)
Addison-Wesley Interactive
Adept Scientific
Advanced Scientific Applications Inc. (SciMath)
Anton Textbooks, Inc.
Artlandia, Mathematica-based software for creating mathematical art
Basic Research Institute in the Mathematical Sciences
Birkhauser AG
Brooks/Cole Publishing Mathematics Page
Chicago Lectures in Mathematics
The Computational Mechanics Company, Inc (COMCO)
CPLEX Optimization, Inc.
Cross Educational Software
Elegant Mathematics, Inc.
Elsevier Publishing
ExcelMath (AnsMar Publishers, Inc.)
Floating Point Software (ExacMath)
GAMS Development Corp. (modeling)
International Press
HandyGraph
Harmonic Software Inc. (Makers of O-Matrix)
Key Curriculum Press
Khayyam Publishing Company, Inc.
Learning in Motion
Lemma Inc.
Logix Consulting
Mandalay Scientific Inc. (Data Modeling)
Mathematica (wri.com)
MatheMatrix, Inc.
MathMedia Educational Software, Inc.
MathPlus
MathPro Press
MathSoft Home Page (Developers of Mathcad)
MathSolutions, Inc.
MathType
MathWare (Derive)
Mathtools.net
MathWorks Home Page (Producers of MATLAB)
Minitab Inc
Neufeld & Associates
Numerical Algorithms Group Ltd
OPCOM Pty Limited
Pedagoguery Software
Polymorf
Principia Consulting
PWS Mathematics
SGI Operations Research Initiative
Soft Integration, Inc.
South-Western Educational Publishing Mathematics
Springer
Springer New York
Steven M. Christensen and Associates, Inc.
TCI Software Research
Thompson Publishing
Thompson Publishing Math Catalog Search
TSP International
Visual Numerics
Maple: Math Software
West Educational Publishing Mathematics and Statistics
XOX Corporation