JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
CollageIt - CollageIt is an easy-to-use and automatic collage maker, which makes photo collage automatically.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
PhotoSpills - Easy to use PC collage software with unlimited design possibilities.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Collagerator - Create amazing photo collages in few mouse clicks. Ready for download for Mac OS X and Windows.