mpaint.net
free online image editor using HTML5. Edit, adjust your images, add effects online in your browser, without installing anything...
paintnet
KolourPaint
KolourPaint is a free, easy-to-use paint program for KDE (a desktop environment for UNIX).
GIMP
GIMP is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It can be used ...
microsoft-paint
DrawPad
Easily Draw and Create Graphic Images. DrawPad Graphic Design and Drawing Software is an easy-to-use image composition and man ...