University of Notre Dame
Notre Dame: The Inquisition Collection
This collection of more than 500 original documents from the Spanish Inquisition features the Holy Offices Manual of Instructions and the Index of Banned Books. The introductory information and notes are in English.
Rice University
Galileo Project: Procedure of the Roman Inquisition
This site from The Galileo Project of Rice University provides a medium length article describing the prosecution of the Roman Inquisition. The information is very interesting and worth checking out on the subject.