FreeCAD (BIM Workbench)
A free, open-source parametric 3D modeler whose built-in BIM workbench provides architectural elements (walls, windows, structure) and clean IFC export.
3.8 /5 composite score
C2 4/5 reflects the full Python API and CLI access, C4 4/5 reflects IFC, DWG, DXF, STEP, OBJ, STL, GLTF, SVG, and PDF support, and RF4 marks community-maintained lifecycle risk.
Solid
Rubric Scorecard
| Criterion | Score | Evidence |
|---|---|---|
| Value for the price | 3/5 | Free, free tier Source → |
| Agent Friendliness | 4/5 | CLI, API: https://freecad.github.io/SourceDoc/ |
| Ease of adoption | 4/5 | -- |
| Portability & lock-in | 4/5 | 11 file formats |
| Interoperability | 4/5 | 5 integrations |
Pricing
ModelFree
Free tieryes
How we verified this: we checked FreeCAD (BIM Workbench) against its live site and an independent source — github.com. Nothing on this page is listed from memory. See how we grade. Verified 2026-07-18.
Evidence
File formats
| Format | Direction | Support |
|---|---|---|
| IFC | unknown | unknown |
| IFC 2x3 | unknown | unknown |
| IFC 4 | unknown | unknown |
| DWG | unknown | unknown |
| DXF | unknown | unknown |
| STEP | unknown | unknown |
| OBJ | unknown | unknown |
| STL | unknown | unknown |
| GLTF | unknown | unknown |
| SVG | unknown | unknown |
| unknown | unknown |
Integrations
Revit (via IFC) ArchiCAD (via IFC) BIMbots IfcOpenShell Blender
Sources
Alternatives in BIM Authoring
Free, open-source native IFC authoring add-on for Blender (formerly named BlenderBIM, renamed Bonsai in 2024). Built on the IfcOpenShell library, it lets users view, author, and enrich IFC BIM models directly inside Blender, covering modeling, drawing generation, and openBIM workflows. Distinct from the catalog's unrelated existing "Bonsai" entry (hellobonsai.com, a freelancer invoicing SaaS).
4.6/5
A full desktop BIM authoring platform from Graphisoft built specifically for architects to model buildings and produce coordinated drawings and documentation.
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A combined CAD-and-BIM design platform from Vectorworks (Nemetschek Group) aimed at architects who want flexible modeling plus documentation in one tool.
4.0/5
A DWG-native BIM tool (from Bricsys, now under Octave) that adds rule-based BIM modeling and auto-classification on top of a familiar AutoCAD-like drafting environment.
4.0/5
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