dnsrev is a script that will generate reverse lookup (PTR) data for all hostnames defined in the given DNS zonefiles. It uses BIND's parser to read zonefiles, so it should support features like $INCLUDE and $GENERATE, and of course it understands IPv6 addresses.
Fusiondirectory is an infrastructure manager. It allows you to manage users, groups, services, servers, workstations, and the deployment of operating systems and software. All these operations are feasible from a Web interface.
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.