API docs for MongoDB drivers:

• C
• C++
• C#
• Erlang
• Haskell
• Java
• JS
• PHP
• Perl
• Python
• Ruby
• Scala (Casbah)

The MongoDB Manual

• MongoDB Manual

Docs for MMS (MongoDB Monitoring Service)

• MMS

Docs for the MongoDB + Hadoop Connecgator

• Hadoop Connector