Here are some useful links:
The world's largest public repository of Ripper-related information.
German language speaking Jack the Ripper website.
To showcase a growing Maybrick archive interlocking stories of Liverpool and the Maybricks with primary source material, plus reviews and articles. Co-ordinated by Chris Jones.
The International Journal for Ripper Studies edited by Dan Norder, Wolf Vanderlinden and Alan Sharp
The monthly colour electronic journal of all things ripperological.
Order or subscribe online to True Detective along with Master Detective, True Crime Detective Monthly magazines or Murder Most Foul, the Quarterly Magazine. You can also order online True Crime Library books and back issues of the magazines.