Not sure is it right place for stuff like this.. anyway, I just want to share my own small project: http://kurzgame.github.io/FastPixel/
You may be ask: "Another one?!". - Not exactly. Yes, there are lot of amazing online pixel art tools, but I was surprised that no one of them can be launched at mobile devices! In same time, it's not another one, this is API! So (I repeat myself), you can make your own pixel-art tool and this time it can be absolutely portable!
Please, write your thoughts if you find this interesting or strange or whatever...