qimgv is a open-source, cross-platform and customizable image (JPEG, GIF, PNG, APNG, RAW etc) viewer with optional video (MP4 and WEBM) support, written in Qt. It supports basic image editing: crop, rotate and resize, as well as copy / move operations of images to different folders.

It targets to have an uncluttered user interface i.e. you see UI elements only when you need them. There is a pull-down panel with thumbnails, as well as folder view (accessible by pressing [pre]<Enter>[/pre]). You can also bring up a context menu by right-clicking on an image.