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 .
Sketch - Professional digital design for Mac.
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.