Paktahn is a frontend for the ArchLinux Pacman database and the Arch User Repository (AUR).
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.
PacStats is able to analyze the log and the lib directory of the ArchLinux package manager (pacman) and generate statistical charts.
Bidirectional RPC support over a simple message interface, e.g. WebSocket.
A camera app for Android.