This module is part of the Apache Sling project.
This is a Sling Resource Provider for MongoDB implementation (from 2012)
The Sling provides also a different implementation based on the Generic NoSQL Resource Provider for MongoDB: https://svn.apache.org/repos/asf/sling/trunk/contrib/nosql/mongodb-resourceprovider
Please note that both implementations are not interchangeable because they store the data in MongoDB in different formats.