Stellarium is a open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors. Just set your coordinates and go. Default catalogue of over 600 000 stars, extra catalogues with more than 210 million stars! Asterisms and illustrations of the constellations. The planets and their satellites. Star twinkling, shooting stars, eclipse simulation. Very realistic atmosphere, sunrise and sunset.

Pidgin is a chat program which lets you log in to accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on MSN, talking to a friend on Google Talk, and sitting in a Yahoo chat room all at the same time. Pidgin runs on Windows, Linux, and other UNIX operating systems. Looking for Pidgin for OS X? Try Adium! Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It can support many more with plugins.