DNS Metasync helps DNS administrators to deploy a DNS cluster where slaves servers' zones are kept in sync with the master: adding or deleting a zone in the master reflects the change on the whole umbrella in an automated fashion
Bind2nsd provides scripts that translate DNS information in BIND format to NSD format, and then copy that translation to an NSD server. The goal is to make it simple to run redundant BIND and NSD servers and keep them in sync, using only BIND files.