The best free alternative to ArchiCAD is FreeCAD, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to ArchiCAD and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to ArchiCAD are SketchUp (Freemium), Sweet Home 3D (Freemium, Open Source), LibreCAD (Free, Open Source) and Shapr3D (Freemium).
SketchUp (formerly Google Sketchup) is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, civil and mechanical engineering, film, and video game design—and available in a freeware version, SketchUp Make, and a paid...
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Some users think SketchUp is a great alternative to ArchiCAD, some don't.
LibreCAD (originally QCad then CADuntu) is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.
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LibreCAD vs ArchiCAD opinions
This alternative is disputed. LibreCAD is still a legitimate alternative to ArchiCAD, but it might have issues that some users think are important.
Shapr3D is a revolutionary 3D modeling software created exclusively for your iPad Pro and your Apple Pencil. Shapr3D is the only truly mobile CAD app - a quick but precise way to create 3D models for engineering, design, 3D prints, and more.
The professional furnishing 2D-/3D-tool for everybody: The pCon.planner is a cost-free application allowing you to comfortably and professionally create complex furnishing concepts and to visualize them in a photo-realistic quality. File Formats: dwg, dxf, 3ds, skp, ...
DreamPlan Home and Landscape Design is an easy to use software to help visualize and plan your dream home with realistic 3D home models. See your dream floor plan with customized kitchens, bathrooms and bedrooms for a home or apartment.