no-herd maintainer-needed@gentoo.org Xapian is an Open Source Probabilistic Information Retrieval 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!) Xapian is designed to be a highly adaptable toolkit to allow developers to easily add advanced indexing and search facilities to their own applications.