Stuff that definitely belongs in hydra-rails gem (formerly hydra-head) – stuff you need to build rails apps that use Fedora, Solr & ActiveFedora
Classes & Helpers for gated discovery, controlled access to views, and permissions-based UI features
MODS Stuff -- currently relies on old AssetsController in hydra-rails2-remnants gem!
Legacy Stuff (mostly UI) that's used by Hydra Heads that were originally built with rails2 hydra code.
Posible gem to create a "starter" app with decisions made up to the level of views, forms, submission workflow, etc.
Possible "Sample Rails App" gem/plugin