OrgLDAP is an extensible LDAP user management application supporting groups, *NIX (POSIX, Shadow), Samba and other account types, SSH public keys and sudo roles. It includes a reusable extensible library and a web-based front-end.
py_xdb_auth is a small but robust jabber-component based on twisted to authenticate jabber users against ldap. It is written for jabberd 1.4 and based on twisted and python-ldap.