SpamCheetah is a network-level spam filtering solution built around OpenBSD greylisting, tarpit, and blacklisting. It comes with a Web interface and requires zero administration. It does not allow spam to even land in your network, thus saving you precious bandwidth. It does not have the 'false positives' problem of losing legitimate mail.
EZPX is a lightweight photoblog engine with all the features you need and a user interface you'll love to use. It can be used as a standalone photoblog application or as a Flickr agent. It features an easy installer/upgrader that notifies you when an upgrade is available, support for templates, and much more.
TIPP is an IP planning application for network departments of organizations with medium- to large-sized networks. While providing all the necessary functions for keeping track of your IP and network allocations, it combines simplicity of design and use with a clean and thoroughly modern look and feel.
DynPG is a content management system based on PHP and MySQL. To work with DynPG, you do not need any programing skills. Because of its simple and organized user interface, it is very easy to use. It has a modular structure. It can adapt to any layout with CSS. It is optimized for search engines. It can show a separate view for printing and PDF. Its backend supports multiple languages. It has an editor for form creation.