Wolfram Research
Wolfram Research is a company headed by Stephen Wolfram. Their primary products are
Mathematica, a computer algebra system, and Wolfram Alpha, a website designed to make the world's data computable. The company also
helps controversial lobbying and
aids the Microsoft monopoly.
Stephen Wolfram
Stephen Wolfram is the founder of Wolfram Research.
Mathematica
Mathematica is their flagstrip product and is closed source (and proprietary). See the respective article for details.