Joker the IRC bot is a PHP class designed for quick and easy IRC bot construction. This base class contains methods that can be executed from your plugins. It has built-in flood protection, timers, and a powerful plugin system that allows you to reload plugin classes on-the-fly, without restarting the PHP console or disconnecting from the network.
sfMarkitupPlugin is a useful Markitup widget, tuned to work with Markdown syntax and extended by inline uploading of media files to the server and previews. It provides a way to turn your textarea field into a simple but powerful text editor. Some additions have been made to its basic functionality to be more helpful for use in CMS.