Freshwater Crayfish
- Hosted by the Carnegie Museum of Natural History.
- http://iz.carnegiemnh.org/crayfish/phpbb2/viewforum.php?f=15&sid=ef09d017dcb6cf9d5d2b8924f04ca7a9

Crayfish Mates
- A world wide community blog for crayfish owners, breeders, and traders.
- http://www.crayfishmates.com/forum/

Flinders Redclaw
- UK supplier of crayfish from Australia. Live sales throughout the EU, and information on the law.
- http://www.redclaws.com

Tropical Crayfish
- Site dedicated to the appreciation of crayfish. Includes a forum.
- http://www.tropicalcrayfish.com/forum/

Crayfish World
- Breeding, care, and identification of freshwater crayfish.
- http://www.crayfishworld.com/contents.htm

Blue Crayfish
- Specializes in an electric-blue North American crayfish species. Basic care instructions and species descriptions. Ships throughout the continental US.
- http://www.bluecrayfish.com