ruby-pdns is a simple framework to develop dynamic DNS records using the Ruby language hosted in a PowerDNS Pipe Backend. The framework abstracts the complexities of coding custom records away from the developer, enabling you to focus on the task.
ogslb is a PowerDNS backend designed to perform global server load balancing using round-robin DNS. It can take into account health/performance to balance requests across multiple destinations. Health is determined using user-created Python scripts.
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.