MicroStation!

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 engineering specialties.FreeCAD features tools similar to Catia, SolidWorks or Solid Edge, and therefore also falls into the category of MCAD, PLM, CAx and CAE. It is a feature based parametric modeler with a modular software architecture which makes it easy to provide additional functionality without modifying the core system.As with many modern 3D CAD modelers it has many 2D components in order to sketch 2D shapes or extract design details from the 3D model to create 2D production drawings, but direct 2D drawing (like AutoCAD LT) is not the focus, neither are animation or organic shapes (like Maya, 3ds Max, Blender or Cinema 4D), although, thanks to its wide adaptability, FreeCAD might become useful in a much broader area than its current focus.FreeCAD makes heavy use of all the great open-source libraries that exist out there in the field of Scientific Computing. Among them are OpenCascade, a powerful CAD kernel, Coin3D, an incarnation of Open Inventor, Qt, the world-famous UI framework, and Python, one of the best scripting languages available. FreeCAD itself can also be used as a library by other programs.FreeCAD is also fully multi-platform, and currently runs flawlessly on Windows and Linux/Unix and Mac OSX systems, with the exact same look and functionality on all platforms. »

AutoCAD is a software application for both 2D and 3D computer-aided design (CAD) and drafting — available since 1982 as a desktop application and since 2010 as a mobile web- and cloud-based app, currently marketed as Autocad 360.

LibreCAD (originally QCad then CADuntu) is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.

BRL-CAD is a powerful cross-platform open source solid modeling system that includes interactive geometry editing, high-performance ray-tracing for rendering and geometric analysis, image and signal-processing tools, a system performance analysis benchmark suite, libraries for robust geometric representation, with more than 20 years of active development.

Microstation DGN alternative - opens a V8 file, V7, a raster CIT file and a hybrid raster file of the moon. Runs completely standalone, does not use or require Microstation or OpenDesign to be installed on the client machine. PDL programming language (based on QBasic) easy to create powerful macros.

ScratchyCAD is a web-based parametric 3D design software with a block-based programming language to create objects for 3D printing, animations, games and websites.

Solid Modeling and NURBS SurfacesHistory Based Modeling Twinsting & BendingShell/Hollow Parts | Convert 2D Profiles into 3DTexture Library of 1400+ MaterialsAutogenerate 2D Automatically

Product and Packaging design | Furniture and cabinet designDIY manufacturing create precision models and export to CNC machines.Use more sophisticated editing to compliment rendering and animation packages.Prototyping with 3D printers | 2D drafting, diagraming and schematic drawingsMarketing images for designs with photorealistic renderingIncludes 19 file formats to share your designs.Compatible with AutoCAD® 2013 DXF/DWGIncludes STL export for 3D Printing

ActCAD is a low cost 2D Drafting & 3D Modeling CAD Software based on IntelliCAD. ActCAD is 100% genuine and legal with IntelliCAD, Teigha and ACIS Technologies.