Dezi is an open source search engine platform licensed under the GPL version 2.
Written in Perl, Dezi is conceptually similar to the Lucene-based Solr or Elasticsearch projects: a HTTP-based search platform capable of indexing multiple document formats (HTML, XML, PDF, DOC, XLS, etc) and returning faceted results in a variety of formats (XML, JSON).
See the Git source code repository for the code.
Join the mailing list.
Try the demo.
IRC on freenode #dezisearch.
Install Dezi from CPAN like any other CPAN module.
Read the documentation.
There are clients for Dezi available (so far) in these languages:
This site uses the dezi-for-wordpress plugin. So search for something on this site, and you’re using Dezi.