I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
Vignette - Vignette: Add film and camera effects to your photos. • 68 effects & 56 frames
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 .
Convertize.io - Convertize is a conversion optimization platform based on consumer psychology.
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Camera Roll - Simple Gallery App for Android, with lovely Material Design.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.