GIMP – The Photo Shop Of The Open Source World
GIMP is the leading photo editor in the open source world. It works like other (proprietary) raster editors including Adobe Photoshop, Jasc Paintshop Pro and Microsoft Paint. You can learn more about the software and even download a copy at http://gimp.org.

FreeMind – Mind Mapping & Organization
FreeMind is a premier free mind-mapping software written in Java. The recent development has hopefully turned it into high productivity tool. We are proud that the operation and navigation of FreeMind is faster than that of MindManager because of one-click “fold / unfold” and “follow link” operations. It can publish vector or bitmap images that can be used in Photoshop or Illustrator.

Bryce 5.5 – Free 3D Landscape Design
Bryce is a powerful piece of software that is capable of generating natural looking landscapes in 3d formats. Daz offers version 5.5 for download at Download.com. Upgrades to the latest version are usually inexpensive. Visit the Mac download page, or visit the Windows download page.