I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
Split Pic - Clone yourself and create collages!
VSCO - VSCO® is an art and technology company empowering people everywhere to create, discover, and connect. CompanyVSCO® is a trendsetting art and technology company that .
DMD Clone - The easy way to clone yourself.
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Photo Blender - Photo Blender is a photo blender editor application developed by Smart Photo Editor for Android and iOS.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.