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There are many, many projects, thousands, in fact, available on Ubuntu to serve all sorts of needs. Here's an alphabetical list of the main applications available on Ubuntu.
(Note: this is currently a work in progress, so more programs will be added daily)
Alphabetical List of Software Available on Ubuntu
F-Spot (Photo Management)
Gcolor2 (Color Picker)
GdMap - (Treemap/Visual representation of your Hard Drive)
GNUpaint (gpaint: Simple Painting Program)
gThumb (Image Viewer)
TheGIMP (Complex Image Editing)
Kdissert (Mindmapping/Brainstorming Application)
OpenOffice.org (Office Suite)
XSane (Scanner Application)
Other Sources for Information on Software
GnomeFiles - Categorizes, rates and lists Gnome-based software.
KDE-APPS.org - Categorizes, rates, reviews and lists KDE-based software.
osalt.com - Lists 'open-source' alternatives to proprietary software.