GIMP squashes more bugs, now works in OS X Mavericks.
imgur: the simple image sharer.
Gimp with modded photoshop interface
GIMPshop 2.6.11.
30 Great Photoshop Tips and Tricks to Help Your Computer Graphic Skills – How-To Geek.
Ultimate CSS Gradient Generator – ColorZilla.com.
FM 100 Hue Test.
Open source Graphic Design.