The best open source alternative to Microsoft 3D Builder is OpenSCAD. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft 3D Builder and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft 3D Builder are FluidCAD, MeshLab, Bforartists and BRL-CAD.
OpenSCAD is a software for creating solid 3D CAD objects. It is free software and available for Linux/UNIX, MS Windows and MacOS.
Parametric 3D CAD in browser using JavaScript scripting, fully interactive viewport editing, non-destructive feature tree control, direct geometry referencing, rapid prototyping, STEP import/export, smart defaults, minimal math, and open source availability.
System for processing and editing 3D triangular meshes, provides a set of tools for editing, cleaning, healing, inspecting, rendering, texturing and converting meshes.
Bforartists is a complete 3D suite to create 3D content. It offers you the full 3D art pipeline to create game graphics, prerendered movies and stills.
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...
Cura aims to be a end solution for personal 3D printing with RepRap based machines. It is tuned toward the Ultimaker, but can be used on any RepRap based design.
QCAD is an application for computer aided drafting in 2D. With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schemas and diagrams.
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.
MatterControl is a free, open source app that lets you organize and manage your 3D prints. It's designed to help you get the most out of your 3D printer - making it easy to track, preview, and print your 3D parts.
STL-to-GCODE translator for RepRap printers
Here comes Slic3r! Its features are:
A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.
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Completely different type of tool