CAD Software

Solid Edge Community Edition
Free
Free professional 3D CAD software for the engineering community.
BrickLink Studio
Free
Build, render, and create instructions.
DWG TrueView
Free
View and convert 2D and 3D DWG files for free.
QCAD
Free
The Open Source CAD System For Everyone.
KiCad EDA
Free (Open Source)
A Cross Platform and Open Source Electronics Design Automation Suite.
LibreCAD
Free (Open Source)
A free Open Source CAD application.
Qucs
Free
An integrated circuit simulator.
Rigs of Rods
Free
A free/libre soft-body physics simulator mainly targeted at simulating vehicle physics.
DWG FastView
Free
A lightweight CAD design software for fast, precisely & easily opening, viewing & editing CAD files.
LayoutEditor
Free
Edit designs for MEMS and IC fabrication.
ProfiCAD
Free Trial
Electrical schematics software.
BRL‑CAD
Free
A powerful open source cross-platform solid modeling system.
SCARM
Free Trial
Simple Computer Aided Railway Modeller.
LibrePCB
Free
Create electronics the easy way.
Residential Wire Pro
Free Trial
Make the design, creation and printing of residential electrical floor plans fast and easy.
Gmsh
Free
A three-dimensional finite element mesh generator with built-in pre- and post-processing facilities.
LEGO Digital Designer
Free
A virtual Lego with an unlimited amount of blocks and accessories.
OpenSCAD
Free
The Programmers Solid 3D CAD Modeller.
KLayout
Free
Mask layout viewer and editor for the chip design engineer.
LDraw
Free
An open standard for LEGO CAD programs that allow the user to create virtual LEGO models and scenes.