Aqueous Process Simulations, Inc.
Simulation calculations and software to compute the chemistry of water-based processes.
http://www.apsiminc.com

ChemEng Software Design
Provides Software Engineering tools for engineers, chemistry\science personnel. All the required calculations, information in a one easy to use package.For Professionals, students and educational use.
http://www.cesd.com/

Process Ace Software
Palm engineering software and Palm hardware for Process and Mechanical Engineers. Steam tables, turbine, heater and pump calculations, handhelds
http://www.processacesoftware.com

Drabold, David
Simulation of glasses and amorphous materials with links to current research on amorphous materials and electronic structure calculations.
http://www.phy.ohiou.edu/~drabold

Wire Gauge calculations
Java script based online AWG calculations.
http://www.mogami.com/e/cad/wire-gauge.html

FeynCalc
The FeynCalc home page, entry point to information about FeynCalc and related programs for High Energy Physics
http://www.feyncalc.org/

Sulphuric
Simulate/Design : Sulphuric acid plant and equipment
http://sulphuric.tripod.com/

ACIMS -- Arizona Center of Integrated Modeling & Simulation
Artificial Intelligence and Simulation Group. The page contains summaries of ACIMS simulation projects, simulation links, and news. One of the main research projects is the Discrete Event Specification Formalism (DEVS).
http://www.acims.arizona.edu/

Averill M. Law and Associates
Averill M. Law & Associates offers simulation consulting, simulation training, and the ExpertFit distribution-fitting software. It was founded in 1977.
http://www.averill-law.com/

Fermat
Computer algebra system that does arithmetic of arbitrarily long integers and fractions, symbolic calculations, graphics, and other numerical calculations. Free download. Documentation.
http://www.bway.net/~lewis/