Open Source (free software)
Get flash to fully experience Pearltrees
Mozilla Firefox
For a few years I have had a signature that noted the various open source projects that could be used as a replacement or alternative to a program Adobe has offered their creative suite software bundles.
Free Open Source Alternatives for Adobe Creative Suite
save your privacy (open network)
3D program
Inkscape. Draw Freely (free)
Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X by Dec 13