3D and CAD
Blender is the only program in this category, and it covers most free 3D work on its own. It is a complete open source suite for modelling, sculpting, texturing, animation, simulation, rendering and video compositing, and it runs on Windows, macOS and Linux.
It is also not a computer-aided design program in the engineering sense. Blender works with meshes rather than parametric features and constraints, so it cannot do what SolidWorks, Fusion or FreeCAD do with dimensioned models and drawing sheets. If your job is producing engineering drawings, Blender is the wrong tool, and this page says so plainly.
Download details are on the Blender program page. Textures, reference photographs and image cleanup for 3D work are usually handled by the tools covered under freeware photo editors.
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Freeware 3D and CAD
Blender
Blender is a complete 3D creation suite from the Blender Foundation, released under the GNU General Public License and available for Windows, macOS and Linux in 64-bit builds. It covers polygon and curve modelling, sculpting, UV unwrapping, procedural texturing, rigging and animation, geometry nodes, physics simulation, two render engines (EEVEE for real time and Cycles for path tracing), a compositor and a video sequence editor. A Python API and a large add-on ecosystem extend it, and professional studios use it for animation, visual effects and game assets. It suits hobbyists, students, independent studios and anyone who needs a full 3D pipeline without licence costs. Its weak points are a steep learning curve tied to keyboard shortcuts, unreliable boolean operations on complex meshes, and a rendering workflow that rewards a capable GPU: Cycles on the CPU is accurate but slow.
Comparison Table
| Program | OS | Licence | Best for |
|---|---|---|---|
| Blender | Windows, macOS, Linux | GPL | Modelling, animation, simulation and rendering for film, games and visualisation |
What Blender Is Not
Blender is not a CAD replacement for parametric engineering drawings, and the difference is architectural rather than a matter of a few missing features. A parametric CAD program stores a feature history with dimensions, constraints and tolerances, and generates drawings from that history, so changing one parameter rebuilds the part. Blender stores geometry, so a dimensional change means editing the mesh by hand.
The practical consequences follow from that: no constraint solver in the core program, no drawing sheets with dimensions and tolerances, and no assembly mates between parts. Add-ons such as CAD Sketcher and MeasureIt narrow the gap, but they are community projects and they do not produce manufacturing documentation. Boolean operations are also less reliable than a solid modeller's, which matters when a model has to be manufacturable rather than merely convincing on screen.
For parametric work, use FreeCAD, SolveSpace or a hosted modeller with a free tier. Blender stays the better choice for organic modelling, animation, rendering and visual effects, and in practice the two kinds of tool are used side by side rather than instead of each other. The full catalog index lists the other categories in this catalog.
Good to know
Is Blender really free for commercial work?
Yes. Blender is released under the GNU General Public License, so you can use it commercially, sell the results and install it on as many machines as you like. There is no paid tier and no royalty.
Can Blender replace AutoCAD or SolidWorks?
No. Blender builds meshes, not parametric feature histories, and it does not produce dimensioned engineering drawings. CAD Sketcher and similar add-ons add sketching constraints, but they are not a substitute for a real parametric modeller.
Which 3D file formats does Blender open?
Blender imports and exports glTF and GLB, FBX, OBJ, USD, Alembic, STL, PLY and Collada, among others. Exact support varies by version, and glTF and USD are the formats its development focuses on.
Is Blender suitable for 3D printing?
It can be, with care. STL export and the bundled 3D Print Toolbox check for non-manifold geometry and wall thickness problems, but mesh modelling means every dimensional change is manual work rather than a parameter edit.
What hardware does Blender need?
A 64-bit Windows, macOS or Linux machine with a reasonably recent GPU and 8 GB of memory as a working minimum, and 16 GB or more for large scenes. CPU rendering in Cycles works without a strong GPU, but it is slow.