Infinity
As we move to new digital era, we tend to rely on tireless machines in almost every aspect of our everyday life. Computer is an infinite source of creativeness and a perfect tool for any digitized activity, from collecting photos to modeling complex systems. ... Throw in the FREE trial version available and flexible licensing policy and you get the absolute winner among math applications perfectly suited for serious scientific tasks and business calculations altogether. ... The application offers unbeatable level of precision outperforming any competing math software when it comes to...
http://www.mathrevolt.com/files/infinity.exe - 2Mb - Download - Screenshot

ultimacalc.exe
UltimaCalc is a scientific and mathematical calculator designed to occupy minimum screen area, making it immediately available for use. UltimaCalc can stay on top of other windows. Type a calculation as plain text, evaluate it, maybe edit it and re-calculate. ... scientific? ... Analyse the effects of multiple variables on data. ... Fit a polynomial to data. ... Regression: Plot a scatter chart and regression line. ... Add title, subtitle, labels. ... Calculate the mean, median and standard deviation of a sample and its population.
http://www.ultimacalc.com/ultimacalc.exe - 3Mb - Download - Screenshot