Here are a fewtools that I find useful.

PWChanger is a simple password changing script written in 89 lines of Expect.
PWVault is a simple password vault written as a 135 line shell script that uses GPG to store passwords.
Sudify is a very simple shell wrapper script to make using sudo less annoying by hiding it.
What is my IP?
This is a simple tool that will tell you what IP the server sees your connection from.