Kiano
Kiano helps to look at your photos in a completely new way. With simple gestures it is possible to visually navigate through all your photos (from your System Photo Library), which are organized according to their similarity on a huge map. Kiano is the only app you need to view and find your photos. Besides image maps with a flat or perspective view, Kiano also offers list views, a professional photo viewer, and a visual similarity search. Kiano presents photos from Apple's System Photo Library. You can have multiple Photo Libraries and assign any of them to be the System Photo Library, but you cannot just open a folder containing all your images.
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FastRawViewer
FastRawViewer opens RAW files extremely quickly and renders them on-the-fly, instead of just displaying embedded JPEGs. It allows a photographer to see the RAW exactly as a converter will "see" it, without any delays or waiting time, guaranteeing the possibility to sort and cull RAW images lightning fast and based on the quality of the RAW itself, not JPEG previews. FastRawViewer's RAW-based tools (unique ones such as RAW histogram, RAW statistics, Shadow Boost, Highlight Inspection, Focus Peaking, per-channel view, as well as familiar ones like Exposure Compensation, White Balance, Contrast Curves) allow one to estimate what converter will be able to squeeze from the RAW image data and make preliminary adjustments to the RAW file, which will be read and applied by Adobe converters.
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XnView
XnView MP/Classic is a free Image Viewer to easily open and edit your photo file. The Image Viewer supports all major image formats (JPEG, TIFF, PNG, GIF, WEBP, PSD, JPEG2000, OpenEXR, camera RAW, HEIC, PDF, DNG, CR2). As Image Viewer you have features like color adjusting, image resizer, cropping, screen capture, metadata editing (IPTC, XMP) and much more. With its easy-to-use explorer-like interface, XnView MP allow you to quickly view your images and photos, but also to make image management. You have features like batch rename, batch converter, duplicate image finder, image compare, but you can also create contact sheets, slideshow.
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FastStone MaxView
FastStone MaxView is a fast, compact and innovative image viewer that supports all major graphic formats. Its intuitive layout lets you view images in a variety of ways. It even lets you view images in password-protected ZIP, RAR and 7-Zip archive files directly and instantly, which is a perfect solution for viewing private images. It also reads comic book files including CBR, CBZ and CB7 formats. It is a handy tool for quickly viewing, rotating, resizing, cropping, annotating and printing images. Auto-hidden menus and toolbars to make the best use of screen space. Many hotkeys for image navigation and manipulation (copy/move/delete/rename/rotate). Undo, redo and mouse wheel support. Its intuitive layout lets you view images in a variety of ways. It even lets you view images in password-protected ZIP, RAR and 7-Zip archive files directly and instantly, which is a perfect solution for viewing private images.
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