What counts as open-source CAD?

The full source code is publicly available under an OSI-approved licence (GPL, MPL, MIT, BSD, etc.), with no commercial-use restriction. Source-available but not OSI-approved tools are excluded.

Best open-source CAD for mechanical design?

FreeCAD is the production-grade choice for parametric mechanical CAD. SolveSpace is a lighter alternative for small constraint-based assemblies.

Best open-source PCB / EDA?

KiCad is the gold standard — a serious production tool used by professional hardware companies. Far more capable than its older "hobbyist" reputation.

Best open-source BIM?

BlenderBIM (Blender + the BlenderBIM add-on) is the closest thing to open-source BIM in 2026. Native authoring is still dominated by commercial tools but BlenderBIM is rapidly closing the gap.

Best Open-Source CAD Software in 2026

Open-source CAD has matured well beyond the "research project" stigma of the 2010s. FreeCAD, KiCad, Blender, LibreCAD, and SolveSpace are all production-grade tools running real commercial work in 2026. Below are every open-source CAD, BIM, and EDA tool in our catalog (all under OSI-approved licences), ranked by expert score.

Looking at free-as-in-cost (incl. proprietary freemium)? Free CAD software covers the wider list.

1.
K
KiCadOpen Source · Windows / macOS / Linux
★ 4.7/5
Free, open-source professional schematic capture and PCB layout suite.
2.
P
PrusaSlicerOpen Source · Windows / macOS / Linux
★ 4.7/5
Open-source slicer from Prusa Research — known for Organic Supports and rapid feature delivery.
3.
BS
Bambu StudioOpen Source · Windows / macOS / Linux
★ 4.6/5
Bambu Lab's PrusaSlicer-derived slicer, optimized for high-speed CoreXY printers.
4.
UC
UltiMaker CuraOpen Source · Windows / macOS / Linux
★ 4.5/5
Free, open-source slicer — the most-used FDM 3D printing prep tool in the world.

Frequently asked

What counts as open-source CAD?: The full source code is publicly available under an OSI-approved licence (GPL, MPL, MIT, BSD, etc.), with no commercial-use restriction. Source-available but not OSI-approved tools are excluded.
Best open-source CAD for mechanical design?: FreeCAD is the production-grade choice for parametric mechanical CAD. SolveSpace is a lighter alternative for small constraint-based assemblies.
Best open-source PCB / EDA?: KiCad is the gold standard — a serious production tool used by professional hardware companies. Far more capable than its older "hobbyist" reputation.
Best open-source BIM?: BlenderBIM (Blender + the BlenderBIM add-on) is the closest thing to open-source BIM in 2026. Native authoring is still dominated by commercial tools but BlenderBIM is rapidly closing the gap.