List of free and open source 2D and 3D CAD viewers.


- FreeCAD

You can use this free 3D CAD software as a 3D and 2D CAD viewer.

Import/export to standard formats such as STEP, IGES, OBJ, STL, DXF, SVG, STL, DAE, IFC or OFF, NASTRAN, VRML in addition to FreeCAD's native FCStd file format. The level of compatibility between FreeCAD and a given file format can vary, since it depends on the module that implements it.


- CAD Assistant

Open Cascade CAD Assistant is a powerful offline 3D CAD viewer and converter with simple and intuitive interface, free for both personal and commercial use. CAD Assistant brings the power of open technologies to the hands of engineers working with 3D data.

CAD Assistant is based on open source libraries (Open CASCADE Technology, Qt, FreeType, FreeImage, etc.) and employs open formats for CAD and mesh data (STEP, IFC, IGES, BREP, glTF, JT, PLY, STL, OBJ, 3DM). It also supports a set of other file formats like DXF, SAT (ACIS), XT (Parasolid).


- VariCAD Viewer

VariCAD Viewer is a free viewer, convertor and printing software working with 2D DWG, DXF, 3D STEP and 2D/3D VariCAD file formats. VariCAD viewer allows you to convert DWG to DXF and vice-versa, convert STEP to 3D IGES or STL formats, print 2D DWG, DXF or VariCAD formats and use batch print or batch conversions. All conversions are also available between VariCAD native format and other listed formats. VariCAD viewer offers settings of 3D display methods (like light source or perspective). 3D display can be also exported into high-resolution bitmap file.


- C3D Viewer

C3D Viewer gives users full control over displaying 3D models, such as navigating and orientating models, changing standard views, switching between parallel and perspective projections, and adjusting levels of detail (LOD). It also plays back animations at varying speeds. This made C3D Viewer useful to both CAD and non-CAD users who access 3D CAD models.

C3D Viewer handles standard CAD formats, such as JT, STEP, X_T and X_B, SAT, IGES, STL, and VRML, and its own C3D format.


- eDrawings

View the most popular native 3D (SOLIDWORKS) and 2D (DWG / DFX) formats in a single viewer. Interrogate the models using the measure tool as well as move and section commands to view model internals. Once opened, files can be saved as eDrawings files for lightweight sharing.


- Solid Edge Free Viewer

The free Solid Edge Viewer allows you to interactively view Solid Edge 3D models and drawings. Rotate, pan, and zoom 3D CAD models, and save images and email them as needed to provide an efficient collaborative process among your team, your customers, and your suppliers. The Solid Edge Viewer is easy to download and install, and allows you to open and view Solid Edge assembly, part, sheet metal and draft files, as well as 2D files including AutoCAD DXF and DWG files.


- JT2Go

JT2Go is the industry leading no charge 3D JT viewing tool.

JT2Go has been unanimously embraced by industry leaders as the premier free viewing tool for JT data. By providing a comprehensive Desktop application and mobile platform solutions on iOS and Android, Siemens has made viewing of JT data available for everyone in nearly any situation.