1)   Orifice 5.1
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.

 2)   ComfortAir HVAC Software 4.0
ComfortAir HVAC software is designed to be used by engineers, architects, contractors and energy auditors for calculating and analysing heating and air conditioning hourly loads in all types of buildings. Units can be set to English or Metric.

 3)   Linear Algebra 2
Performs computations associated with matrices: Solves systems of linear equations, finds sum, difference, product, determinant, trace, inverse, adjoint, transpose, eigenvalues, eigenvectors, LU factors, QR factors, tests for definiteness, etc.

 4)   Feet and Inches Calculator Freeware 1.0.50
Absolutely the best and easiest to use feet and inches (Architectural) calculator. The feet and inches calculator accepts all commonly used types of feet and inches input. The simple interface makes it extremely easy to use.

 5)   S3Dfree 2000 6
S3Dfree 2000 is the FREE unregistered version of Solid3D. Solid3D Fastener library is a productivity tool for AutoCAD allows you to create solid models of assorted Nuts, Bolts, Screws and Washers.

 6)   HatchKit 2.6
Draw patterns from scratch, open existing pattern files or import DXF or HPGL. Paste Clipboard. Save to AutoCAD,ACADLT,Alibre,AllyCAD,DataCAD,GeneralCADD,IntelliCAD,MegaCAD,MicroStationV8,Revit,SolidWorks,Spirit,TurboCAD,VersaCAD or VisualCADD format

 7)   Sheet Lightning 3.60
Sheet Lightning is a specialised engineering 2D/3D CAD System for creating and unfolding sheet metal designs for fabrication or manufacture. It handles cylinders, cones, square-to-round adapters, ovals, intersections and mutli-intersections.

 8)   Math Mechanixs 1.1.0.1
Math Mechanixs is a general purpose math program with a Math Editor for solving mathematical problems and taking notes, extensive Function Library and Function Solver, 2D & 3D Graphing, and a Calculus Utility with integration and differentiation.

 9)   Engineering Power Tools 1.9.8
ENGINEERING POWER TOOLS solves a wide variety of common engineering problems quickly and easily. Over 70 programs and data tables integrated into one easy-to-use package. Categories include Math, HVAC, Mechanical, Electrical, Materials & Structural.

 10)   I C CAD 1.1.0
This is the simple, fast CAD viewer you have been looking for. Works with AutoCAD (.DWG) and Microstation (.DGN) files. When you are ready to buy, unlock the trial from within the program. Quick and easy!

 11)   Easy Measure Converter 1.0
Download Free Measure Converter: inch, feet, yard, rod, furlong, mile, league, chain. Length and Distance Conversions.The program interface is quite simple so even if you are a beginner you can use it without any trouble.

 12)   Terrain for Rhino 3.0 1.0
Terrain for Rhino is a terrain modeling plug-in for Rhinoceros (commonly known as Rhino). This plug-in gives Rhino the ability to create a terrain mesh from a set of unordered points.

 13)   XYit 3.1
With XYit you can digitize xy co-ordinates of points & lines in images, enabling you to capture their original x-y values. And you can do the reverse, plotting xy numerical data back onto an image, ideal for making maps of proposed routes etc.

 14)   ShapeBook with 2D3DSteel 3.10
A structural steel reference and AutoCAD drafting tool for steel construction. View dimensions and properties. Search shapes by property values. Convert shape lists between US and metric. Based on AISC Manual of Steel Construction LRFD Third Edition.

 15)   The GD&T Trainer: Professional Edition 3.0
Effective, economical GD and T training on CD-ROM. Contains interactive lessons, technical animations, narration, 3D part drawings, course administration tools. Valuable for designers, engineers, and anyone who uses engineering drawings.

 16)   Eroiica Redline 4.6
Stand-alone or integrated with EDM/PDM via its rich API, Eroiica Redline facilitates fast and accurate viewing, redlining, annotating, printing and converting of 200+ engineering size 2D/3D vector, raster, text or hybrid document formats.

 17)   PLCAD 1.01
PLCAD is a Windows 2D CAD software. PLCAD is a powerful drawing program that gives you the ability to create professional two-dimensional drawings.

 18)   Uconeer 2.4
Freeware. 397 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.

 19)   Abacus Math Writer 4.0
MathWriter is a java stand-alone program that allows for the production of, Mathematical, Scientific and Engineering equations and formulae.Schoolteachers and Lecturers will find MathWriter useful for producing notes, reports and test papers.

 20)   Eroiica Lite 4.6
Stand-alone or integrated with EDM/PDM via its rich API, Eroiica Lite facilitates fast and accurate viewing, printing and conversion of engineering size CAD/CAM/CAE document formats - 2/3D vector, raster, text or hybrid formats.