Economics and econometrics in Mathematica.
http://www.verbeia.com/mathematica/
A set of Mathematica notebooks on many topics.
http://www.ecs.fullerton.edu./~mathews/c2000/
Internet hosting specializing in webMathematica services.
http://www.hostsrv.com/webmaa/app1/MSP/webm1003/HostSRVHome.msp
A mathematical word processor and easy to use front end for Mathematica.
http://www.directmath.com/
A package, written in Mathematica, for the manipulation and identification of binomial and hypergeometric series and identities.
http://radon.mat.univie.ac.at/People/kratt/hyp_hypq/hyp.html
International Mathematica Symposium.
http://south.rotol.ramk.fi/keranen/IMS97/IMS97.html
Java applet for displaying and rotating three-dimensional Mathematica objects. Also has the ability to calculate stereo images, show animations, and embed hyperlinks.
http://wwwvis.informatik.uni-stuttgart.de/~kraus/LiveGraphics3D/
Company specializing in consulting and training in Mathematica. Based in Mountain View, CA, USA.
http://www.variablesymbols.com/