Client - A replacement for the bundled ZooKeeper class that takes care of some low-level housekeeping and provides some useful utilities
Framework - The Curator Framework is a high-level API that greatly simplifies using ZooKeeper. It adds many features that build on ZooKeeper and handles the complexity of managing connections to the ZooKeeper cluster and retrying operations.
Recipes - Implementations of some of the common ZooKeeper "recipes". The implementations are built on top of the Curator Framework
Utilities - Various utilities that are useful when using ZooKeeper.