Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Online Image Editor - Online editor for images and animated gifs with multiple effects and tools
PixaPal - Create videos, graphics and documents online
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
GIMP Online - Powerful graphics editor in the cloud
RealWorld Photos - RealWorld Photos is an free portable photo editor for Windows.