digiKam - Professional Photo Management with the Power of Open Source
Priime - Edit photos with the styles of the world's top photographers. Smart suggestions, fast editing, and inspiring collections.
Adobe Photoshop Lightroom CC - Adobe Photoshop Lightroom CC is a commercial photo processor and image organizer.
Nizo - A better iPhone camera for shooting film
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
VSCO Cam - VSCO Cam is an iPhone, iPod Touch, & Android camera app w/ elegant, minimal processing options.