Picview
Picview is an image viewer for macOS with a nice minimal modern user interface. Picview works great with JPEG, HEIC, PSD, RAW, WEBP, PNG, GIF, and many other formats. Provides basic image processing, including flip and rotate, EXIF, and other information. Supports keyboard shortcuts and trackpad gestures. The most important, Picview like Windows' default picture viewer — Photos, where zoom in and out with the mouse wheel and switch between images with arrow keys and/or with on-screen buttons.
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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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Pixea
Pixea is an image viewer for macOS with a nice minimal modern user interface. Pixea works great with JPEG, HEIC, PSD, RAW, WEBP, PNG, GIF, and many other formats. Provides basic image processing, including flip and rotate, showing a color histogram, EXIF, and other information. Supports keyboard shortcuts and trackpad gestures. Shows images inside archives, without extracting them. Supports JPEG, HEIC, GIF, PNG, TIFF, Photoshop (PSD), BMP, fax images, macOS and Windows icons, radiance images, and Google's WebP. RAW formats Leica DNG and RAW, Sony ARW, Olympus ORF, Minolta MRW, Nikon NEF, Fuji RAF, Canon CR2 and CRW, Hasselblad 3FR. Sketch files (preview only) and ZIP archives. Export JPEG, JPEG-2000, PNG, TIFF, and BMP. Pixea supports animated GIF, PNG, and WebP images.
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FocusOn Image Viewer
Lightweight and fast free image viewer for Windows. Quickly view and simply edit photos. Free for everyone, for personal and commercial use. Automatically organize your photos by date. Maintain photo editing without damaging the original. Sharing photos on Blogs, Twitter, and Facebook. Over 100 image formats are supported. Windows XP SP3 or later supported (Windows 7, Windows 8, Windows 8.1, Windows 10...) Supported image formats are JPG, PNG, GIF, BMP, TIF, JP2, J2K, PSD, AI, EPS, CR2, NEF, ARW, DNG, RAW, etc. You can organize image files in a familiar Explorer-type interface with thumbnails. Simple image editing is also available there such as resizing or rotating. You can view image details through the zoom and edit image with crop, filter, adjust, and other functions without damaging the original. The edited image can be shared with others by publishing on the Blog, Twitter, and Facebook or can be organized automatically with one click.
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