CCADAlts

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FreeCAD

3D & parametric CAD

Open-source parametric 3D modeller for real-life objects

Stars
★ 34.5k
Licence
LGPL-2.1+
Updated

Alternative to SolidWorks, Fusion 360

Blender

Mesh & visualisation

Free and open-source 3D creation suite

Stars
★ 21k
Licence
GPL-2.0+
Updated

Alternative to 3ds Max, Rhino

O

OrcaSlicer

3D printing & CAM

Open-source slicer with built-in printer calibration tools

Stars
★ 16k
Licence
AGPL-3.0
Updated

Alternative to Simplify3D

OpenSCAD

Code CAD

The programmers' solid 3D CAD modeller

Stars
★ 10.5k
Licence
GPL-2.0
Updated

Alternative to Fusion 360

PrusaSlicer

3D printing & CAM

Feature-rich open-source slicer for FFF and resin printers

Stars
★ 9.4k
Licence
AGPL-3.0
Updated

Alternative to Simplify3D

UltiMaker Cura

3D printing & CAM

Popular open-source 3D-printing slicer

Stars
★ 7.1k
Licence
LGPL-3.0
Updated

Alternative to Simplify3D

LibreCAD

2D drafting

Open-source 2D CAD application

Stars
★ 6.5k
Licence
GPL-2.0
Updated

Alternative to AutoCAD

CadQuery

Code CAD

Python library for building parametric 3D CAD models

Stars
★ 6k
Licence
Apache-2.0
Updated

Alternative to Fusion 360

MeshLab

Mesh & visualisation

Open-source system for processing and editing 3D meshes

Stars
★ 5.9k
Licence
GPL-3.0
Updated

Alternative to Geomagic Design X

Adam

AI CAD tools

AI CAD copilot for Onshape and Fusion, plus open-source CADAM

Stars
★ 5.3k
Licence
GPL-3.0
Updated
S

SolveSpace

3D & parametric CAD

Lightweight parametric 2D/3D CAD with a constraint solver

Stars
★ 4.2k
Licence
GPL-3.0
Updated

Alternative to SolidWorks, Fusion 360

build123d

Code CAD

Pythonic code-CAD framework on the OpenCascade kernel

Stars
★ 3.5k
Licence
Apache-2.0
Updated

Alternative to Fusion 360

KiCad

PCB & electronics

Open-source electronics design automation suite

Stars
★ 3k
Licence
GPL-3.0
Updated

Alternative to Altium Designer, Eagle

LibrePCB

PCB & electronics

Beginner-friendly open-source EDA suite

Stars
★ 3k
Licence
GPL-3.0
Updated

Alternative to Altium Designer, Eagle

Bonsai (BlenderBIM)

Architecture & BIM

Native IFC BIM authoring inside Blender

Stars
★ 2.9k
Licence
GPL-3.0
Updated

Alternative to Revit

OpenFOAM

Simulation (FEA & CFD)

Free, open-source computational fluid dynamics toolbox

Stars
★ 2.3k
Licence
GPL-3.0
Updated

Alternative to ANSYS

Dune 3D

3D & parametric CAD

Modern parametric 3D CAD built on SolveSpace's solver and OpenCascade

Stars
★ 2.1k
Licence
GPL-3.0
Updated

Alternative to Fusion 360, SolidWorks

QCAD

2D drafting

Free, open-source 2D CAD for technical drawings

Stars
★ 1.9k
Licence
GPL-3.0
Updated

Alternative to AutoCAD

E

Elmer FEM

Simulation (FEA & CFD)

Open-source multiphysics simulation software

Stars
★ 1.7k
Licence
GPL-2.0
Updated

Alternative to COMSOL

ParaView

Simulation (FEA & CFD)

Open-source data analysis and visualisation for simulation results

Stars
★ 1.7k
Licence
BSD-3-Clause
Updated

Alternative to Tecplot

Q

Qucs-S

PCB & electronics

Circuit simulator GUI using ngspice, Xyce and other engines

Stars
★ 1.4k
Licence
GPL-2.0
Updated

Alternative to OrCAD

Horizon EDA

PCB & electronics

Modern EDA package for schematics and PCB layout

Stars
★ 1.3k
Licence
GPL-3.0
Updated

Alternative to Altium Designer, Eagle

Zoo Design Studio

AI CAD tools

CAD-as-code modeller with a built-in Text-to-CAD AI agent

Stars
★ 1.3k
Licence
MIT
Updated

Kiri:Moto

3D printing & CAM

Browser-based slicer and CAM for 3D printers, CNC and lasers

Stars
★ 921
Licence
MIT
Updated

Alternative to Simplify3D, Fusion 360

Gmsh

Simulation (FEA & CFD)

3D finite-element mesh generator with a built-in CAD engine

Stars
★ 125
Licence
GPL-2.0+
Updated

Alternative to ANSYS

C

code_aster

Simulation (FEA & CFD)

Structural and thermomechanical FEA solver developed by EDF

Stars
★ 32
Licence
GPL-3.0
Updated

Alternative to Abaqus, ANSYS

Backflip

AI CAD tools

AI that turns 3D scans, sketches and prompts into CAD

Licence
Proprietary
Status
Paid (free trial credits)

BRL-CAD

3D & parametric CAD

Constructive solid geometry modelling system with decades of history

Licence
LGPL-2.1
Status
Open source

Alternative to CATIA

C

CalculiX

Simulation (FEA & CFD)

Free three-dimensional structural finite-element program

Licence
GPL-2.0
Status
Open source

Alternative to Abaqus, ANSYS

EasyEDA

PCB & electronics

Free browser-based schematic and PCB design

Licence
Freeware
Status
Free (proprietary)

Alternative to Altium Designer, Eagle

Leo AI

AI CAD tools

AI assistant for mechanical engineers, grounded in engineering sources

Licence
Proprietary
Status
Paid (team plans)
N

ngspice

PCB & electronics

Open-source mixed-signal SPICE circuit simulator

Licence
BSD-3-Clause
Updated

Alternative to OrCAD

Onshape Free

3D & parametric CAD

Free plan of PTC's browser-based professional CAD

Licence
Proprietary
Status
Free (proprietary)

Alternative to SolidWorks, Fusion 360

SALOME

Simulation (FEA & CFD)

Open-source platform for simulation pre- and post-processing

Licence
LGPL-2.1
Updated

Alternative to ANSYS

Solid Edge Community Edition

3D & parametric CAD

Free edition of Siemens' professional CAD for hobbyists and makers

Licence
Proprietary
Status
Free (proprietary)

Alternative to SolidWorks, Inventor

Sweet Home 3D

Architecture & BIM

Free interior design and floor-plan app with 3D preview

Licence
GPL-2.0
Updated

Alternative to SketchUp