JugiPaint - JugiPaint is a painting software with diverse tools for various types of illustration work.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
Paint +++ - Paint +++ is a native image editor for Mac that enables you to complete everyday image editing tasks in a single place.
Paint XP for Windows 7 - Standalone old MS Paint program that allows you to get your old XP Paint interface in Windows 7.
Paintastic - Paintastic allows you to make beautiful drawings, paintings, designs and greeting cards.
Wizardbrush - Wizardbrush is a natural media painting software which has a lot of brushes and paper with realism style. You can create realistic picture with it.