David Richman's Site - Information about Arachnida research and photos of spiders and scorpions.

British Arachnological Society - Promotes study of the Arachnida, particularly spiders, pseudoscorpions, and harvestmen.

Arachnodata - Established in 1986, Arachnodata is the world's only information- and coordination agency for scorpions and other arachnid animals.

Study of Arachnids - Courses, educational projects, and museum/zoo exhibits, dealing with the subject of arachnology, with catalog descriptions of the courses.

American Arachnological Society - Society information, articles from recent issues of the Journal of Arachnology, graduate study program list, ask-an-expert, arachnid photos, Brown Recluse ID, and links.