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 complete IPsec and IKEv2/IKEv1 implementation for Linux 2.4 and 2.6 kernels.
A portable, fast, light, and extensible IRC client.