Priime - Edit photos with the styles of the world's top photographers. Smart suggestions, fast editing, and inspiring collections.
Darktable - darktable is an open source photography workflow application and raw developer.
Dark Room - A quick, powerful photo editor that gives you control
RawTherapee - RawTherapee is a free RAW converter and digital photo processing software.
Nizo - A better iPhone camera for shooting film
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.