BlenRig
5.9#20 in 3d rigging softwareFree planFree planLinuxmacOSWindows
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BlenRig suits Blender users rigging and skinning biped characters, including those who want automated weighting and guides in the rigging workflow. It is not currently described as supporting non-biped characters.
Houdini suits 3D artists and technical teams working in areas such as film, games, motion graphics, or synthetic data. Apprentice is an option for non-commercial learning and personal projects, with render limits to consider.