Xapian is a highly adaptable toolkit which allows developers to easily
add advanced indexing and search facilities to their own applications.
It supports the Probabilistic Information Retrieval model and also
supports a rich set of boolean query operators.
This includes the xapian bindings for PHP, Ruby, Java and Python.
Yaniv Aknin
Lee Packham
Adam Vandenberg
David Edmondson
Sven Dahlstrand
Jannis Leidel