FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Manual Camera for iPhone - Custom exposure for your iPhone camera
IrfanView - IrfanView ... one of the most popular viewers worldwide.
NeuralCam Night Photo - The first night mode camera for the iPhone
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Halide - A premium camera for your phone