lbnamed

A DNS server written in Perl that handles dynamic updating and polling to return the best answer(s) to a DNS query.

see http://www.stanford.edu/~schemers/docs/lbnamed/lbnamed.html

While I'm a big fan of Perl, BIND certainly has a much larger and proven installed base. One should be prepared to focus considerable hacking efforts if using lbnamed!

SQL-aware BIND

A few projects have been around to tie BIND's DNS data into lightweight SQL database engines such as mSQL and MySQL. This can have other advantages besides using DNS for load balancing; web-based DNS administration or distributing the DNS data becomes a great deal easier. However, as with the above, be ready for some tinkering under the hood to get a SQL/BIND framework operative.