Opensource applications resources

Gimp

 * http://gimp.org
 * http://www.gimpusers.com/
 * http://gimpmagazine.org/

Inkscape

 * http://inkscape.org/
 * http://inkscapetutorials.wordpress.com/

Scribus

 * http://scribus.net/

Blender

 * http://www.blender.org/
 * http://blenderart.org/issues/
 * http://www.blendernation.com/

OpenSCAD

 * http://www.openscad.org/
 * http://zype.co.nz/articles/3d-printing-openscad
 * http://zype.co.nz/articles/3d-printing-inkscape-3d
 * http://zype.co.nz/articles/3d-printing-openscad-variables