I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
Glass - Refract, reflect, disperse, divide. A game of lasers and experimentation.
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 .
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Rich Kids - Photo sharing app where users pay $1000/mo to share
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.