EdisterBot is the web crawler for Edister.com. A "crawler" is simply software that fetches web pages, records details about those pages, and examines them for links to other web pages -- which it then fetches and examines, etc.
Topclick Prospects Spider is a program built by Topclick Prospects to collect data on the web. We save down information such as how well the websites are constructed for search engines. The spider crawls nonstop.
