Mozilla Firefox, free web browser, is created by a global non-profit dedicated to putting individuals in control & shaping the future of the web for the public good.
Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Miro is a free application that turns your computer into an internet TV video player. You can download it here for Windows, Mac, or Linux.