DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
Darktable - darktable is an open source photography workflow application and raw developer.
digiKam - Professional Photo Management with the Power of Open Source
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Flickr - image and video hosting website