TORVS Research Team
Software for reaction prediction, synthesis design, classification of organic reactions, chemical information, calculation of 3D coordinates, and calculation of physicochemical parameters.
http://www2.chemie.uni-erlangen.de/software/index.html

Math Corp
Our financial calculators software delivers proven loan calculation, financial calculation and online financial calculation functionality with unsurpassed performance and versatility
http://mathcorp.com

Industrial Network Calculation
Dipl. Ing. Friedel J. BlŠser offers tips on calculation of industrial energy distribution networks; also, network analysis and synthesis.
http://www.fjblaeser.de/

Mechanical Aids to Calculation
The invention of the world's first automatic totalizer by Sir George Julius, Mechanical Aids to Calculation - extracts of a paper presented to the Institution of Engineers Australia in 1920
http://members.ozemail.com.au/~bconlon/calcaids.htm

Pocket-Book for Railroad and Civil Engineers
Facsimile of an early calculation assistant which contained methods for laying out railroad curves, switches, frog angles, and crossings, the staking out of work, levelling, and the calculation of cuttings and embankments. Produced by Oliver Byrne in 1864.
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJS1974

Calculation programs for machine design
KISSsoft sells calculation programs for machine design which are based on norms like AGMA, DIN, ISO.
http://www.kisssoft.ch/

Mental Calculation World Cup 2004
Mental Calculation World Cup 2004, a contest for mental calculation in Annaberg-Buchholz, Germany
http://www.recordholders.org/en/events/worldcup04/

NRG Compliance, Inc
NRG Compliance provides energy compliance services including title 24 report, title 24 energy calculations and title 24 energy analysis and documentation for residential and non residential buildings in California
http://www.nrgcompliance.com/

ProbSy
probability calculation tool for bridge players
http://www.hugin.dk/probsy/index.html

CNC Automatika, S.I.A.
New controls and servo systems. Online price calculation.
http://www.cnc.lv