IrfanView - IrfanView ... one of the most popular viewers worldwide.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
nomacs - nomacs is a free, open source image viewer, which supports mu
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.