The screen shots below are from my computer (not promotional broo ha ha) so you have a real world idea of what they truly look like and what some of the options and features are.
Click on either image to view larger and in a new window.
1. FastStone Image Viewer. From their website: "a fast, stable, user-friendly image browser, converter and editor. It has a nice array of features that include image viewing, management, comparison, red-eye removal, emailing, resizing, cropping and color adjustments. Its innovative but intuitive full-screen mode provides quick access to EXIF information, thumbnail browser and major functionalities via hidden toolbars that pop up when your mouse touches the four edges of the screen. Other features include a high quality magnifier and a musical slideshow with 150+ transitional effects, as well as lossless JPEG transitions, drop shadow effects, image annotation, scanner support, histogram and much more."
2. IrfanView. "IrfanView is a very fast, small, compact and innovative graphic viewer for Windows. It is simple for beginners and powerful for professionals. It has created new and/or interesting features in its own way and is the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support."
It really does have a bunch of features, too numerous to list here.