I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
Open Camera - Open Camera is an open-source camera app for Android phones and tablets.
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 .
Secure Camera - Modern camera app focused on privacy and security with QR & barcode scanning.
PicsArt - Explore 100,000,000+ awesome images and photos on the web
PhotonCamera - Android Camera that uses enhanced image processing.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.