I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
Adobe Lightroom - Adobe Lightroom is a family of image organization and image manipulation software.
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 .
digiKam - Professional Photo Management with the Power of Open Source
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Darktable - darktable is an open source photography workflow application and raw developer.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.