- The `Maven project website`__: is the place where we can get the latest versions of Maven, general documentation and main plugins, etc.

- The `dependency browser`__ of the Maven project repository: this lets you search for artifacts from the Maven project repository that you may want to include as dependencies.

- The `Codehaus plugin repository`__: the *Mojo* project of Codehaus develops additional plugins for Maven.

- The book `Better Builds With Maven`__: the authors are some of the main developers of Maven, and we can download a free copy of the book after registration. 

- `Maven: The Definitive Guide`__: another book about Maven, available for reading online or as a PDF download under a Commons license.

__ http://maven.apache.org
__ http://repository.sonatype.org/index.html
__ http://mojo.codehaus.org/
__ http://library.mergere.com/
__ http://www.sonatype.com/products/maven/documentation/book-defguide