Powerdns Tango is a simple Web frontend for PowerDNS written in the Perl dancer framework. Its design philosophy is to (hopefully) make DNS management simple, easy, and as quick as possible. It supports both MySQL and PostgreSQL backends.
dtools (Distributed tools) is a suite of programs that allows Unix commands to be run in parallel on a list of tagged hosts. It is based on Capistrano and Fabric, has a modular architecture and is easy to extend, and has full integration with SSH.