Search engine for personal data contained in various internet services.
"Ferret is a high-performance, full-featured text search engine library written for Ruby. It is inspired by Apache Lucene Java project."
"Xapian is an Open Source Search Engine Library, released under the GPL. It's written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C#, and Ruby (so far!)"