adapter - generic adapters for RecyclerView or ViewPager with data binding support
arch - base classes for MVVM architecture (based on Architecture Components)
graphics - utilities for working with bitmaps and drawables
media - utilities for working with images, sounds and videos
rest - helper classes for managing REST API calls
rx - helper classes for managing RxJava observables and subscriptions
utility - bunch of miscellaneous utilities
view - collection of custom views and layouts