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 many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SketchUp are FreeCAD, Sweet Home 3D, Wings 3D and MakeHuman.
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.
Open-source, Java-based software that allows users to create detailed floor plans, arrange furniture, and explore the final layout in 3D, assisting in interior design projects with ease and flexibility.
Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware.
It is possible to assign materials, vertex color, UV coordinates and textures, but there will be improvements in those features before Wings goes 1.0.
There is no support in Wings for doing animations.
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.
BRL-CAD is a powerful cross-platform open source solid modeling system that includes interactive geometry editing, high-performance ray-tracing for rendering and geometric analysis, image and signal-processing tools, a system performance analysis benchmark suite, libraries for...
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.
K-3D is free-as-in-freedom 3D modeling and animation software. It features a plugin-oriented procedural engine for all of its content, making K-3D a very versatile and powerful package.
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.
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Good generic 3D modeller, but not as suited for quick space modelling.