Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Tag That Photo - Your Photos in Your Control by Tag That Photo Software. Face Recognition, Privacy, Tagging and more.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
digiKam - Professional Photo Management with the Power of Open Source
Corel AfterShot Pro - Say hello to Corel AfterShot Pro 3, the world’s fastest photo workflow tool! Edit your photos up to 4x faster than Lightroom so you can spend more time behind the camera. Download a free 30-day trial today!
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.