Storm-contrib is a set of modules for performing common tasks in Storm, and particularly for integrating with various 3rd-party tools. These are wheels that should not need to be re-invented by every developer who wants to build something non-trivial on top of Storm.
For more information about Storm itself, see the Storm GitHub repository.
Storm-contrib currently consists of the following modules:
General-purpose tools (for example, a ClockSpout) that implement patterns used by various other modules.
A simple pattern for writing records from a Storm stream to a MongoDB collection.