XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Photopus Pro - Photopus Pro is an easy to use batch image processing to simplify the process to convert, add watermarks (text and image), resize, transform, touch-up, rename, and apply effects to your digital images.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Online Image Converter - Online Image Converter converts your BMP, JPG, PNG, GIF or ICO files quickly and easily.
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.