rigging topic
polySymmetry
Maya tool for finding the symmetry of a polygon mesh based on the topology.
AEToolbox
JS automation for After Effects; also a great template for any ScriptUI project.
kinefx_tools
Collection of rigging tools and utils for Houdini Kinefx
MoPlugs
MotionBuilder Extensions Pack
polyReorder
Maya plugin with tools to reorder the vertices on a mesh to match the order of another.
xformArrayNodes
Maya plugin with nodes designed to operate on transform components.
Bluik
2D/Cut-Out Rigging and Animation tools for Blender
VRoidBones
Blender's "make it pretty" button for armatures imported from VRoidStudio.