11 Free And Useful Open-Source Alternatives For Designers

http://inkscape.org/download/?lang=en
http://www.xaraxtreme.org/
http://www.les-stooges.org/pascal/pencil/
http://plasticbugs.com/?page_id=294
http://www.blender.org/download/get-blender/
http://imgv.sourceforge.net/download.html
http://avidemux.sourceforge.net/download.html

don't know how to download:
http://www.w3.org/Amaya/
http://www.cinepaint.org/download.html
http://jahshaka.org/Downloads