A plugin for Firebug similar to YSlow

twialogue ermöglicht es, gezielt die Diskussion von bis zu fünf twitter-Usern nachzuvollziehen, ohne zwischen deren Seiten hin und her zu springen und ohne den Usern selbst zu followen (einzuge Ausnahme: geschützte Profile)

Gaphor is an easy to use modelling environment. This means that you are able to create nice UML diagrams for documentation and to assist you with design decisions. Gaphor will help you create your applications.

Squeezing some extra bytes out of your images

The cleverbox provides an interactive command line shell dedicated to the deployment and maintenance of trac and subversion instances.

piwik is an open source (GPL license) web analytics software. It gives interesting reports on your website visitors, your popular pages, the search engines keywords they used, the language they speak… and so much more.