The best open source alternative to Autodesk Revit is FreeCAD. If that doesn't suit you, our users have ranked more than 25 alternatives to Autodesk Revit and five of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Autodesk Revit are Bonsai BIM Add-on, Sverchok, B-processor and Archimedes CAD.
A powerful open-source parametric 3D modeler ideal for mechanical engineering, supporting Python scripting, running on Windows, Linux, and Mac, with modular architecture allowing extensive adaptability and use with scientific computing libraries.
An add-on for beautiful, detailed, and data-rich OpenBIM with Blender. It was named BlenderBIM until 2024. It uses the ifcopenshell.
Sverchok is a parametric tool for architects and designers. You can use it to program objects' shapes without knowing any programming languages.
B-processor is BIM software that has been and currently is still developed by the Arhus School of Architecture in cooperation with the Alexandra institute.
Archimedes is a free and open source CAD (Computer Aided Design) software. It is a robust system built over Eclipse’s Rich Client Java Platform fully based on plug ins. This means it is easily extensible but also has a pretty thin core that allows you to select the features you...
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The FreeCAD BIM Workbench is increasingly a useful alternative to Autodesk Revit. It includes many similar tools and has good IFC support. So while it is not a drop-in replacement, it is viable for smaller projects. Do some research on their forum and see what you think.