I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
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 .
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Meitu - Meitu is a standalone photo editing application that offers almost all those features and photo editing tools that lets the smartphone users personalize their photos like a professional makeup artists and fashion designers.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
AirBrush - An all in one lifestyle and selfie editor.
Manual Camera for iPhone - Custom exposure for your iPhone camera