The best open source alternative to SketchUp is Blender. If that doesn't suit you, our users have ranked more than 100 alternatives to SketchUp and ten of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SketchUp are FreeCAD, MakeHuman, Dune 3D and CAD Sketcher.
A comprehensive open-source 3D software suite for modeling, UV unwrapping, texturing, rigging, and animating. It supports renderings, simulations including fluid and cloth dynamics, complex compositing, video editing, and Python scripting, running across all major operating systems.
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.
Free interactive open source software for swift creation of customizable 3D human models, featuring precise morph controls, realistic pose simulation, real-time editing, multi-platform export, and support for body, facial, and garment customization in many animation pipelines.
Dune 3D operates as a parametric 3D Computer-Aided Design (CAD) software. It provides users with the capability to sketch and constrain both in 2D and 3D dimensions. Furthermore, it allows for the addition of chamfers and fillets to designs.
CAD Sketcher is a free and open-source project looking to enhance precision workflows in Blender by bringing CAD like tools, features and usability to Blender.
MakerSCAD is a web-based parametric 3D design software with a block-based programming language to create objects for 3D printing, animations, games and websites.
Sverchok is a parametric tool for architects and designers. You can use it to program objects' shapes without knowing any programming languages.
CaDoodle is a local drag-and-drop CAD application for Linux (Arm,x86), WIndows (X86), and Mac (Arm,x86) and ChromeOS. Users models are stored locally, and the application runs entirely locally. CaDoodle has a drag and drop interface that is cross-trainable with TinkerCAD.
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Good generic 3D modeller, but not as suited for quick space modelling.