KeiSpade is a wiki and content management system that uses HTML5 technology. It lets you upload movies or music into the sites it produces, and subsequently lets you can watch them without any plugins (like Flash or Java).
Living Css Tools is a build utility to allow given Web functionality specified at w3.org and whatwg.org to work in those Web browsers (user agents) that only support the functionality with a proprietary namespace.
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.