Polarr Photo Editor 3 - The most powerful photo editor in the web.
Duotone - Convert any photo to a duotone in seconds
Fenetre App - Picture in picture for your mac.
Zombocam - Filters and effects for your webcam
Darkroom 2.0 for iOS - The photo editor for enthusiasts, rebuilt from the ground up
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.