RWMA (Ruby window manager addons) is a modular wrapper around dmenu and dzen for adding various keyboard driven actions to (usually minimalistic) window managers, inspired by ruby-wmii. Its main purpose is launching programs and displaying notifications, but it can be expanded with plugins (for example translation, music player control, and volume control).
LarryMessenger is a simple to install and easy to use cross-platform instant messenger client. It has a nice graphical user interface, and allows people to communicate over a LAN with static IP addresses without the need for a central server. Furthermore, it provides functions to query the ICQ and AIM networks.