step

Checks that a real hand tool can reach, turn and remove every fastener in a mechanical assembly. STEP in, verdicts out: terminal, JSON, exit codes for CI.

Give your agent CAD superpowers.

FreeCAD MCP adapter for AI agents to create and validate parametric documents, edit primitives and booleans, and exchange CAD geometry through FreeCADCmd in the DCC-MCP ecosystem.

Clearance-first inverse-fill enclosure generator for STEP/BRep hardware — CLI-first, MIT licensed.

Automated technical-drawing generation for build123d and STEP files

A workshop for build123d models with live preview and interactive parameters

Package manager for things. Start designing modular hardware! PartCAD is the standard for documenting manufacturable physical products (a.k.a. Digital Thread or TDP). It comes with a set of tools to maintain product information and to facilitate efficient and effective workflows at all product lifecycle phases, boosted by AI.

occtkit CLI + ScriptHarness for OCCTSwift — 26 headless verbs (compose / reconstruct / drawing-export / metrics / mesh / render-preview / XCAF / ...) over OCCT 8.0.0 BREP geometry, JSON-driven, OCCTMCP-ready

Free, open source parametric CAD for 3D printing. Sketch, constrain, model and export STEP, STL or 3MF. Windows, macOS and Linux.

Functional CAD design for 3D printing — replacement parts, brackets, adapters, enclosures and STL/STEP modifications.

Conway is a high-performance IFC&STEP engine for web-based CAD applications

A port of KodaCAD 0.2.2 from PythonOCC + PyQt5 + Conda to OCP + PySide6 + uv.

📐 Describe a part, get a printable model: a native macOS CAD studio powered by Claude Code and build123d.

FDM loop for agents: one PRINT_SPEC, VibeCAD, a gated STL per body, the Rage CAD inspector, and Lego or IKEA sheets. A render is not print approval.

Structural diff and three-way merge for 3D models (STL, OBJ, glTF/GLB, STEP), with a browser viewer, git drivers and a pull-request Action.

Local Windows CAD from Peak Horology. GPL-3.0-or-later.

Fast and minimalist 3D viewer.

Web CAD library with exact B-Rep geometry

ModelScript is a completely web-native, polyglot incremental compiler supporting multiple engineering domains — from requirements and system architecture to simulation, CAD, CAE, and manufacturing. By natively supporting Modelica, SysML v2, and STEP, ModelScript enables seamless cross-domain simulation-based requirements verification.

ArtiFix is a free web-based platform for the conversion, repair, and visualization of CAD/CAM and 3D mesh files. It supports 50+ formats including STL, OBJ, PLY, GLB, GLTF, FBX, 3MF, DAE, WRL, OFF, DXF and 3D PDF. No registration required.