Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
miniPaint - Online graphics editing tool use HTML5 technologies like Canvas, Offline support, Drag and Drop.
GIMP - GIMP is a multiplatform photo manipulation tool.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Paint XP for Windows 7 - Standalone old MS Paint program that allows you to get your old XP Paint interface in Windows 7.