Zmarties

The University of Glasgow has a project called Terrier, which is described as

"software for the rapid development of Web, intranet and desktop search engines. More generally, it is a modular platform for the rapid development of large-scale Information Retrieval applications, providing indexing and retrieval functionalities."

Its a search engine, written in Java, and made available under the Mozilla Public Licence.

Keeping in with the dog naming theme, they also have a linked program called Labrador which is a distributed web crawler (or spider), written in Perl.