From Furiatsu: Keyboard Image Viewer is built to be run in full-screen and controlled by a keyboard. It's perfect for managing large image collections. It watches a specified set of folders for images, tags and ratings are supported, searchable, detects duplicate images by both file hash and image content, and "Smart playlists" of images: based on rating and tags. It is fully customizable keyboard and mouse controls and delete and rename images quickly from within the app. It has a compact infobar at bottom of screen gives maximum viewing area for images.
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