Sheet Lightning is a specialised engineering 2D/3D CAD System for creating and unfolding sheet metal designs for fabrication or manufacture. It handles everything from simple cylinders, cones, rectangular ducts and ovals, to adapters, adapting any of these section types, interections and multi-intersections between of any of these types to any level of complexity.

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.

Data Master 2003
Free software for automation of professional test and measurement systems, data acquisition, processing and analysis. Especially suitable for scientists who would like to make high-performance, precise measurements in the experimental physics.

AlcoDens
Convert density of ethanol-water mixtures to and from concentration expressed in Mass, Volume or Molar terms. Covers concentrations from 0% to 100% and temperatures from 10C to 100C. Calculate blending ratios based on source or blend properties.

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.

WetRO
Quickly and easily design or analyze stormwater collections system pipes with this useful tool. Any number of inlets and pipes and any number of collection systems can be input depending on user's hardware/system memory.