Net::Nessus::XMLRPC is Perl interface for communication with the Nessus scanner over XMLRPC. It lets you start, stop, pause, and resume scans. It can display the progress and status of scans, download reports, etc.
Tweetty is a cute, tiny, post-only client for Twitter. It runs on your command-line.
A network utility for downloading content from the Web.
A graphical temperature monitor for Linux.