PyUserCreate is a tool for *NIX OSes that allows you to accept user account requests from a web interface, and use a simple command-line tool to approve/disprove requests.
The Distribulator: Distributed Computing For The Rest Of Us. This is an SSH-based command execution and file transfer utility that includes support for batch, console, and shell integration modes, multiple server enviornments, and full audit logs.
A specification and toolkit to allow structured input and output for programs. Wrappers for common UNIX commands that use this (above) library to eliminate the need for text parsing when integrating these commands using shell pipes.