Master of Puppets is a simple and fast modular autorig for Maya.
It originally made for Project Borealis' production needs but is meant to be fit any pipeline and can be customized heavily by:
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Creating your own modules.
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Writing scripts that will be called by the autorig at key moments (pre/post build, pre/post publish, etc.).
Building a full biped body rig currently takes between 1 and 5 seconds, depending on whether you have your node editor opened or not... :)
That being said, this tool is still a work in progress and I wouldn't recommend using it for production yet.
Thanks to Project Nayuki for the color space conversion algorithms! https://www.nayuki.io/page/srgb-transform-library