The best free alternative to Blender is Wings 3D, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Blender and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Blender are Bforartists, Natron, Spline and Armory 3D.
Artist3D is an extraordinarily easy-to-use 3D polygon modeling tool. It works completely without forms, pull-down menus, pop-up menus and text input. Only one modeling window covers each operation function. Less than 30 operation elements control the active interaction options.
Loki Render allows you to create your own render farm, serving Blender render jobs to a group of computers. Loki is easy to setup and runs on Linux, Windows or Mac, making it a quick and flexible distributed network rendering solution!.
Sculptopa is a browser-based mesh editing tool designed as a lightweight alternative to desktop tools like Meshmixer and Blender. It focuses on practical workflows such as cleaning, repairing, sculpting and preparing STL and mesh files without requiring local installs or GPU hardware.
Archisketch is a scale-aware sketching program ideal for Architects, interior and landscape designers, product designers, design students, or anyone working with design on an iPad.
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Rebaslight is a program that can be used to rotoscope glows onto images and video. It has almost nothing in common with Blender.