PlugUI is a sysadmin Web interface for small ARM-based devices running Arch Linux ARM. It will run on other distributions, but the package manager is geared to use pacman.
Paktahn is a frontend for the ArchLinux Pacman database and the Arch User Repository (AUR).
PacStats is able to analyze the log and the lib directory of the ArchLinux package manager (pacman) and generate statistical charts.
A programmable packet sniffer.
A thumbnail generation library for Java with a fluent interface.