Picker Builder is a python script for Autodesk® Maya®, which allows to maximally automate the creation of a picker for characters of any complexity.

Picker Builder consists of two parts - Picker Builder and Picker Viewer.
The Picker Viewer is free. You can edit an already existing picker in it.
Picker Builder - generates the picker directly.  The trial version allows generating picker 10 times. 

Full version - picker-builder.com 

 Picker Builder :

• analyzes rig structure
• recognizes body and face parts
• finds fingers controls
• renders character silhouette
• generates selection sets by forward-inverse kinematic attributes
• lays out all controls to avoid intersection

Picker Viewer (free) :

    Edit mode :

• add a custom scripts items on MEL or python language
• copy-paste scripts items between characters
• add custom objects (locators, cameras)
• create custom selection sets
• apply styles to all controls and create your own styles
• move, rotate and scale blocks and controls
• align controls horizontally and vertically
• hold Alt for symmetry
• apply symmetry for selected or all controls
• offset hue, saturation, values of colors

   Animation mode :

• move and rotate characters controls inside Picker
• select controls by hierarchy by scroll mouse wheel
• shows inputs of attributes by color outlines (animation, constrain, blend, inputs)
• channel box mode - change attributes for all selected controls or by one
• isolate view for the whole character 

Picker Builder- Before purchase, this is a limited version. You can build pickers 10 times.

Picker Viewer - It is free! You can edit an already existing picker in it.