Alloy Artifacts is an insanely detailed compendium of hand tool history. When I came across it I thought, “Hey, how much could they write about wrenches?” — and an hour later I had barely scratched the surface of this site. Rather than start on their main page I suggest heading over to the site index, which has an alphabetical listing of all the tool manufacturers, designers and patents.
I loved reading about the history of the Vlchek company; I had always wondered about the story behind the name I found on many of my yard-sale finds. In any case this is an amazing site and well worth clearing your schedule for.
Alloy Artifacts [Website]