The D*A*M Forum | discussion of vintage fuzz pedals (as well as modern recreations) spanning over a decade

DiscoFreq’s Guitar Effects Database
| one of the longest-running websites devoted to guitar pedals

Graphtronix | [JP] data dumps from Yoshi Murata’s collection

Valve-amps.com | Alan Vale’s collection of vintage amplifiers

Voxac100.org.uk | a very thorough resource on the history of Vox equipment

Freestompboxes.org, DIYstompboxes.com & Tagboardeffects | resources for DIY fuzzbox builders