Turba is the Horde contact management application. It is a production level address book, and makes heavy use of the Horde framework to provide integration with IMP and other Horde applications. It supports SQL, LDAP, Kolab, and IMSP address books.
A library to extract a TLD from a URI and check email validity.
A tool for creating disk-at-once and track-at-once CDs, DVDs, and BluRays.