Gimp
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.
www.gimp.org

Linux
Linux is a free Unix-type operating system, originally created by Linus Torvalds.
www.linuxlinks.com Or www.linux.org

Mozilla
Home of the free to download - Firefox, the award winning web browser and Thunderbird for safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views.
www.mozilla.com

Open Office
OpenOffice.org is a multi platform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute.
www.openoffice.org/index.html

Opera
Opera is a free to download web browser.
www.opera.com