miniPaint -
miniPaint is free online image editor using HTML5. Edit, adjust your images, add effects online in your browser without installing anything. You can use the Electron based version of the editor if you like.
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Paper Camera -
Paper Camera is the BEST Sketch/Cartoon app in the App Store. That it's in REAL TIME & NOT post is beyond great. Combine this with a word blurb app & we might be witnessing the birth of a new kind of Underground Comic.
Snapseed -
Snapseed is a photo enhancement and sharing app with a powerful suite of imaging filters and tools for anyone, anywhere, to transform any image into an extraordinary photo.