Online directory of breeders from all over the world.
Rat Guide.com
A thorough medical guide to rat health, medication, and many other aspects of serious rat care.
RatsRule.com
A basic guide to rat care, interesting rat tidbits, and a well-populated forum.
Breeder's Assistant
A wonderful program to help breeders keep track of their rats' information. Free version is available.
Hawthorn Rat Varieties
The most complete rat varieties website I have seen so far. EDIT: Recenly it looks like a lot of their pictures were removed, and they are no longer updating their website.
