Presco - Apply photographers' Lightroom Presets on mobile
digiKam - Professional Photo Management with the Power of Open Source
Polarr 2.0a - An online photo editor (big data meets Lightroom)
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
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.