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DataFit is a tool used to perform nonlinear regression (curve fitting), statistical analysis & data plotting. Fit equations with up to 100 parameters to data with up to 20 independent variables. Define your own equations or choose from over 600 pre-defined equations. Results include customizable 2D/3D plots, as well as detailed fit information. Export code in BASIC or C to use an equation in a user written program. Easy to learn and use.

Download DataFit 8.0

MITCalc
This multi-language calculation package includes solutions for gearing, belt, chain, springs, beam, shaft, and many others. MITCalc support 2D and 3D CAD systems, Imperial and Metric units and many international standards (ANSI, ISO, DIN….).

Orifice
Orifice calculates size, flowrate or pressure drops for gas and liquid orifice meters based on ANSI/API-2530-1991, Part 3 (AGA-3) or the International Standard ISO-5167-1:1991. Customary or SI units.

GOWProp
GOWProp calculates gas, oil and water PVT properties based on user selected method: - Gases: Natural Gas, Air and Nitrogen; - Liquids: Oil, Water, Methanol, MEG, DEG and TEG

CopanMobile for PocketPC
CopanMobile for PocketPC allows you to COGO (coordinate geometry), process field surveys, adjust map traverses, perform map/deed checks, calc curves and areas/perimeters, transform coords, interface with GPS, and import/export Ascii files. It's free.

BeamBoy
BeamBoy is a free engineering utility for calculating stress and deflection of structural beams under load. May also be used for shafts. BeamBoy is menu-driven and intuitive.