MITCalc is the multi-language mechanical and technical calculation package. It includes solutions for gear, belt and chain drives, springs, beam, shaft, bolt connection, shaft connection and many others. The calculations are compatible with many types of 2D (AutoCAD, IntelliCAD..) and 3D (Inventor, SolidWorks) CAD systems and support both Imperial and Metric units and are processed according to ANSI, ISO, DIN, BS, Japanese and other standards.

Exfilt
Quickly and easily design or analyze stormwater detention ponds and below grade systems for exfiltration/infiltration. Design stormwater systems to meet exfiltration volume drawdown time criteria.

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….).

Uconeer
Freeware. 390 units in 46 categories. Includes engineering specific categories like enthalpy, heat capacity, heat transfer coefficient, torque and viscosity. Work with feet and inches. Formatting and clipboard features. Excludes archaic units.

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.

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.