SolidWorks A solid modeling program for mechanical engineers and designers, as well as add-on applications. http://www.solidworks.com/

MCS, Inc. Makers of the Anvil Express software for mechanical design, that also has manufacturing features. http://www.mcsaz.com/

CoCreate A software subsidiary of HP that develops mechanical CAD and design management software. http://www.cocreate.com/

IronCAD Solid modeling software for mechanical designers and engineers. http://www.ironcad.com/

MechSoft Database of standard parts with tools for performing mechanical calculations, for use with many CAD systems. http://www.mechsoft.com/

VariCAD 2D/3D mechanical engineering CAD System for Windows and Linux. http://www.varicad.com/

Ashlar Inc. Vellum 3D CAD program and Vellum Solids 3D modeling software. http://www.ashlar.com/

SteelCad Steel detailing software with packages for structural design, detailing, and manufacturing. http://www.steelcad.com/

Function Bay, Inc. Virtual prototyping of complex mechanical systems with the RecurDyn software products. http://www.functionbay.com/

Engineering Software Solutions Developers of engineering based design software for special requirements in industries such as petrochemical, ship building, mining, civil, mechanical, structual, manufacturing, defence and aerospace. http://www.ess.com.au/

Think3 Produces mechanical CAD software for conceptual design through engineering to manufacturing for products in many industries. http://www.think3.com/

Drew's MCAD Connection A technical resource for users of Autodesk's MCAD products including Mechanical Desktop and Inventor. http://www.mymcad.com/

freeCAD A basic CAD program for creating collections of 3D elements, which can be connected by joints, constraints, actuators, springs, dampers, or forces for running motion simulations. http://www.askoh.com/

ProSpur+ A program designed to create drawings of spur gears, as symbols for ProCAD+ on Acorn RISC computers. http://www.dsnell.zynet.co.uk/PS/ProSpur.html

Pilot3D A relational trimmed NURB curve and surface 3D modeling program, useful for boat hulls and other applications. http://www.pilot3d.com/

Solid ConceptMecaSoft Develops and sells SolidConcept, a parametric 3D solid modeling software for creating parts, assemblies and automatic 2D drawings. http://www.solid-concept.com/

Sigmetrix LLC Develops and supports CE/TOL, a tolerance and variation analysis software package for mechanical design and manufacturing processes. http://www.sigmetrix.com/

SnapCAD A mechanical design software package for TEMA type shell and tube heat axchangers and ASME pressure vessels. http://www.snapcad.com/

Intergraph SmartSketch A 2D parametric drawing program for Windows, that works on AutoCAD and MicroStation files. http://www.intergraph.com/imagine/

CADables TurboCAD hatch patterns, color palettes, and related resources. http://catalog.stormloader.com/