Darktable - darktable is an open source photography workflow application and raw developer.
digiKam - Professional Photo Management with the Power of Open Source
RawTherapee - RawTherapee is a free RAW converter and digital photo processing software.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Smart Pix Manager - Smart Pix Manager is a powerful and reliable solution for the management and viewing of all documents, common images, sound (WMA, MP3), and video files (AVI, MPEG), etc.