This is the namespace for John the Ripper. It may contain pages on and links to things such as tutorials for new users, advanced usage examples beyond those included in the official documentation, Contributed patches for John the Ripper (as well as instructions on how to extract tarballs and apply patches and how to make them), John the Ripper benchmarks, and most useful and currently relevant excerpts from john-users mailing list.
Also, there's a page on existing efforts to introduce parallel processing and distributed processing into JtR.
There are a list of Algorithms for and easy understand.