The script allows you to create mirrors from your Blendshapes, even for different geometries, which could be the case of a character with symmetric arms that are separate geometries.
Soft Cluster EX is a python and c++ based tool for converting soft selection to cluster or joint, supports common types of deformable geometry(e.g. polygon,nurbs ,subdiv and lattice) with a lot of advance features.
Motion Track is MEL script based automated Motion Track creation script with lots of additional functionality which is not available with Maya default path animation. It provides more efficient and controllable options to control path animation.
For practice, I rewrote in Python and PySide2, the script cometRename.mel by Michael Comet. A nice renaming utility that allows basic Prefix, Suffix, Search & Replace, and Rename & Number methods.