Darktable - darktable is an open source photography workflow application and raw developer.
Polarr Photo Editor 3 - The most powerful photo editor in the web.
Adobe Lightroom - Adobe Lightroom is a family of image organization and image manipulation software.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
IMG.LY - Power Your Apps with IMG.LY | The Leading Provider of Design, Photo, and Video Editing SDKs