Pixlr is a cloud-based set of image tools and utilities, including a number of photo editors, a screen recorder browser extension, and a photo sharing service. The suite was intended for non-professionals, however the apps range from simple to advanced photo editing.
Sumo Paint is an online image editor, without need to install anything to your device. It's the most versatile photo editor and painting application that works in a browser. You can open and save images from your hard drive or save it to cloud.