XnView is a multi-format graphics browser, viewer, and converter.
It can read more than 400 file formats, e.g. gif, bmp, jpeg, png, targa, multipage tiff, mpeg, avi, quicktime, and many more.
XnView has an Explorer like viewer that allows quick browsing of directory contents in both thumbnail and preview views.
Its features include HTML page generation, contact sheets, twain support (scanner & digital cameras), batch conversion and image processing, full screen slide shows, image manipulation with effects like 'Tile' or 'Glass', screen capture and file operations.