DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
New VSCO - Now with a focus on community and an in-app camera 📷
Darktable - darktable is an open source photography workflow application and raw developer.
Pretty Instant - Interactive event photography.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Halide - A premium camera for your phone