There is a large number of case studies online, in a variety of file formats, that can reveal useful competitive intelligence. They are posted online by various parties: the competitor's suppliers and other contractors, as well as by industry associations, academic establishments, analysts and others. Much of the time they have been carefully sterilised to reveal little of substance. Case studies that are published with the names of the competitor are clearly showing that they are less subject to secrecy.
The key search phrase is "case study: competitor_name". For example:
The type of competitive intelligence that the resulting web pages provide includes suppliers, products used, processes and a bounty of miscellaneous information.