twidge is a client for microblogging sites such as Twitter and Identica (identi.ca). It is extremely versatile, can be customized to work the way you want to work, and can be combined with other tools to do just about anything. It can be used interactively from the shell. It is useful directly as-is, and with simple shell aliases can make a highly efficient system to do exactly what you want. It is perfectly capable of being your only client for microblogging. It can also be used in an automated way, via cron(1), or it can even integrate with your email system.
Vayala is a multi-purpose chat client for developers. It offers a platform and an easy to use Eclipse plugin. Based on multicast technology, each client is automatically connected to one chat client network without a central server or much configuration or installation effort. You add the Eclipse view, and you are connected to your colleagues. In addition to basic chat functionality, you can also exchange files, graphics, and much more.
use_name_as_alias is a script that reads a GAIM 2.0 BuddyList file (~/.gaim/blist.xml) and assigns aliases based on the contact's name, but only for contacts without a locally user-defined alias. This feature was present in GAIM 1.5, but was removed in 2.0. It makes use of the ElementTree.py module, which is included.
Raven's System Stats allows users to collect detailed information about an operating system, including kernel architecture, distro, operating system, kernel version, glibc version, name of login shell, number of CPUs, CPU description, hyperthreading support, CPU MHz, CPU cache, bogomips, used and total RAM, used and total swap, filesystem size and type, uptime, unique users logged in, total login shells, currently running processes, total processes since bootup, load average, X resolution, and the number of X servers running.