Why it's useful
Feed it an unrigged mesh, say one you got out of an image-to-3D model, and it predicts the bones and how the mesh bends with them, then writes it back out as a rigged FBX or GLB. It is not limited to humans, so four-legged creatures and props with moving parts work too. Weights are MIT like the code.
What it needs
An NVIDIA graphics card with 8GB+ memory. Set up for Linux; Windows means WSL or some fiddling with CUDA extensions. Check the weights before animating, as hands and tails sometimes need a tidy-up.
Image: Viber Cove. UniRig belongs to VAST AI Research (Tripo) and Tsinghua University; we just think it's worth knowing about.
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