ImageVisu is freeware that displays a wide range of images in a fast interface. It has basic controls for orienting and fitting images, zooming, and printing, and it displays slideshows. It's part of the GeoVisu Suite, a free set of image, GIS, and GPS tools. However, you can choose to install only ImageVisu or any combination of the three.
ImageVisu installs three components: GeoVisu, GpsDiffuser, and ImageVisu, with optional file association check boxes to make ImageVisu our default tool for displaying JPEGs, bitmaps, and other common (and not-so-common) file types. GeoVisu's graphics editor-style interface opened when the installer finished, but we closed it and opened ImageVisu from GeoVisu Suite's Start menu folder, which accesses not only the suite's tools but also a Log Directory, Configuration, and Documentation folders.
You can drag and drop an image into ImageVisu or open images from Explorer context menus or by clicking them directly, if the file type is associated with ImageVisu, but we were surprised that there was no file browser or Add button or other way to open files directly inside the program.
Once we'd opened a file, ImageVisu let us click through the whole folder as well as enable a slideshow. We imagine most users will simply click to open images most of the time. ImageVisu opened with its window sized to individual images when we clicked Visualize on context menus in Explorer. We could quickly reorient images clockwise or counterclockwise or flip them vertically. A Global view tool let us grab images and drag them around; toggling it off re-centered images automatically.
ImageVisu doesn't offer much in the way of options, and the configuration file is a text file that appeared to be half in French, half in English. But it's fast and can open a wide variety of images, including some unusual types generally found in geographical applications. Which brings us to the other point, which is that ImageVisu might best be viewed as a component of the GeoVisu suite or as a specialized image viewer for users with images for GIS and similar systems.