Check out the new tutorials on the Bifrost Modular Rigging Framework, by Maya rigging expert Matthew Tucker.
The Rigging Module Framework is a modular, compound-based system for building character rigs in Bifrost. It provides a flexible structure and data types for assembling individual rig parts into complete, production-ready rigs.
Watch the full Bifrost Rigging playlist on the Maya Learning Channel. You can also read more about rigging in the Bifrost help here: Bifrost Rigging Module Framework.