Overall, Nomacs is a wonderful software with amazing features, which works fine with Windows 8.1 too. The features might seem small, but when they add up they make up a great application. Nomacs has more than all the features that an ideal image viewer should have and comes with a wonderful and easy to use UI.
Thanks to its well-organized set of functions, you can easily configure the dedicated parameters. Photos can be uploaded into the working environment using drag and drop operations or the built-in browse function.
nomacs looks nice and simple and offers the components I like to have in a viewer, such as a built-in folder tree, a thumbnail preview panel, a thumbnail strip, a few sorting options, a histogram, EXIF information, fine image quality and good speed.