FreeCAD is a general purpose parametric 3D CAD modeler. The development is completely Open Source (LGPL License). FreeCAD is aimed directly at mechanical engineering and product design but also fits in a wider range of uses around engineering, such as architecture or other...

SketchUp (formerly Google Sketchup) is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, civil and mechanical engineering, film, and video game design—and available in a freeware version, SketchUp Make, and a paid...

Asset Forge allows anyone to create 3D models and 2D sprites using building blocks. Finished assets are compatible with most available game engines.

helps you capture building design concepts digitally anytime, anywhere ideas strike. Use real-world site information to help create forms in context and support early design decisions with real building data.

CATIA (Computer Aided Three-dimensional Interactive Application) (in English usually pronounced /k?'ti?/) is a multi-platform CAD/CAM/CAE commercial software suite developed by the French company Dassault Systèmes.

nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability. It is totally free, for business, professional, or personal purposes. It is fast, lightweight, capable, and , unlike most free CAD programs, completely uncrippled. nanoCAD includes:

BricsCAD Shape lets you create without limits. Sculpt your ideas in solids from the start. It’s the power of free-form modeling with full CAD accuracy.

Sketchup Automation Tools is a Handy Toolbar Launcher that works special in Sketchup Pro Software. What this Launcher can do is instead of moving the Mouse Pointer to the Toolbars, the Toolbars comes to you in a Single Mouse/Stylus/Touch Click.