I was asked by Joseph Brandenburg the developer of ChainTools to have a look at his new free add-on, a perfect compliment for riggers.
About Chain Tools
ChainTools is an addon for riggers that want to quickly prototype new ideas, or create novel, complex rigs that can't be generated by existing automatic rigging tools. Instead of creating an entire rig from a set of parameters, ChainTools automates the creation and management of bones and groups of bones. If Rigify is like a butcher's cleaver, ChainTools is like a surgeon's scalpel.