LeoCAD is a Qt-based CAD program for creating virtual LEGO models.
LeoCAD is completely compatible with LDraw’s parts library.
This is free and open source software.
Key Features
- Easy to use – intuitive interface that is designed to allow new users to start creating new models without having to spend too much time learning the application.
- Rich feature set that enables experienced users to build models by using techniques that are more advanced.
- Fully compatible with the LDraw Standard and related tools, and it reads and writes LDR and MPD files so that you can share and download models from the Internet. It also uses the LDraw parts library, which has over 10,000 different parts and continues to receive updates.
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: www.leocad.org
Support: GitHub Code Repository
Developer: Leonardo Zide
License: GNU General Public License v2.0

LeoCAD is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| CAD Software | |
|---|---|
| FreeCAD | 3D-Solid and general purpose design CAD/CAE |
| QCAD | Professional CAD System |
| LibreCAD | CAD in two dimensions |
| BRL-CAD | Constructive Solid Geometry (CSG) solid modeling system |
| OpenCASCADE | Technology, 3D modeling & numerical simulation |
| SALOME | Platform for numerical simulation |
| OpenSCAD | Programmers solid 3D CAD modeller |
| KiCad | Integrated environment for all of the stages of the design process |
| Chili3D | Browser-based 3D CAD application for parametric modelling |
| LeoCAD | Design virtual models you can build with LEGO bricks |
| SolveSpace | Parametric 3d CAD tool |
| CadQuery | Python parametric CAD scripting framework |
| Electric | The Electric VLSI Design System |
| gCAD3D | 3D CAD-CAM application which features an integrated 3D OpenGL viewer |
| XTrackCAD | CAD program for designing model railroad layouts |
| KLayout | Viewer and editor for integrated circuit and mask design |
| Dune 3D | Parametric 3D CAD |
| CAD Sketcher | Constraint-based geometry sketcher |
| build123d | Python CAD programming library |
| Design | 2D CAD software for GNOME |
Read our verdict in the software roundup.
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