NX Studio is described as 'computer software that allows users to enjoy the viewing, processing, and editing of still images and video, and provides more intuitive operation' and is an app in the Photos & Graphics category. There are more than 100 alternatives to NX Studio for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Xfce. The best alternative is IrfanView. It's not free, so if you're looking for a free alternative, you could try nomacs or ImageGlass. Other great apps like NX Studio are XnView MP (Free Personal), FastStone Image Viewer (Free Personal), XnView (Free Personal) and JPEGView (Free, Open Source).
Xee is an streamlined and convenient image viewer and browser. It is similar to macOS's Preview.app, but lets you easily browse the entire contents of folders and archives, move and copy image files quickly, and supports many more image formats.
Fast Picture Viewer with compact UI, that can be hidden. It can view images insides archives, as well as comic book formats. It has 26 different image filters, that can stays applied when changing image. Automatically adjusts itself to your screen.
The Ristretto Image Viewer is an application that can be used to view, and scroll through images. It can be used to run a slideshow of images, open images with other applications like an image-editor or configure an image as the desktop wallpaper.
GPicView is a simple and fast image viewer with low memory usage. This little program is not aimed to be powerful or feature-rich. Its aimed to replace the default image viewer of current desktop systems.
feh is an X11 image viewer aimed mostly at console users. Unlike most other viewers, it does not have a fancy GUI, but simply displays images. It is controlled via commandline arguments and configurable key/mouse actions.
Simplistic Image Viewer with focus on speed of rendering and switching between images. A good complement when no editing capabilities are nessesary. Feature high-lights: * The only image viewer you need for viewing & browsing images.