PixlrEditor

Online photo editor

Gimp (open source ) file -

GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, and in many languages.

Seashore
(open source for Mac) file

Tux Paint

(open source drawing software for kids) file


Brushes for iOS


Phixr - Online Photo Editor


BeFunky


PicMonkey


Drawisland

There is an iPad version and iPhone version also

Draw.io

This is a free online diagram software for making flowcharts, process diagrams, org charts, etc. When opening for the first time, it asks where you want to save to. One of the options is Google Drive. Give permissions and your drawings will be stored in your drive.