Further to my earlier post on coffee-based film development, Caffeine-Ascorbate Developers are a class of developers that you can literally make in your kitchen.
Additional linkage: Developer recipes; Development times; Discussion & examples
Photographic formulas from The Frugal Photographer
Here, we have a collection of formulae from the Frugal Photographer website. At least one seems to have been lifted from The Darkroom Cookbook, Third Edition (Anchell, 2008), which is as in-depth a resource as any modern photographer could want.