Analytica provides consulting and training to the Mathematica community.

A web hosting company dedicated to providing MathScript capabilities to websites.

MathC provides statistical consulting using Mathematica, visualization of mathematical concepts in the area of teaching Mathematics, and Mathematica-applied college-level mathematics.

Developers and distributors of MathTensor, a Mathematica-based package for performing tensor analysis by computer. Formerly MathSolutions, Inc.

Mathematica training and consultancy, The Salford Color Math package, and a list of Mathematica tips.

Consulting with Mathematica: Scientific Arts is a consulting and creative services company which provides targeted solutions for a broad range of scientific enterprises.