Edge

Edge (or rather, Edge Crawler) is one of the internal names of a small independent internet search engine hosted on search.marginalia.nu. The search engine seeks out old, and old-looking websites with lots of text.

The search engine also goes by the name of Astrolabe.

It's a significant part of WMSA, and has subcomponents that do the usual helpful tasks, such as unit conversion, calculations, spell checking, encyclopedia suggestions.