Photo Mechanic is described as 'Plug in your memory cards and start picking winners and deleting rejects almost instantaneously. Move from image to image without that annoying rendering delay. Add dynamic caption, copyright, and keyword information individually or in batches' and is a Image Viewer in the Photos & Graphics category. There are more than 10 alternatives to Photo Mechanic for a variety of platforms, including Mac, Windows, Linux, PortableApps.com and SaaS. The best alternative is XnView MP. It's not free, so if you're looking for a free alternative, you could try Adobe Bridge or ApolloOne. Other great apps like Photo Mechanic are XnView (Free Personal), Spect (Paid), Phiewer (Freemium) and NX Studio (Free).
Bridge CC gives you centralized access to all the files and assets you need for your creative projects. Organize personal and team assets, batch edit with ease, add watermarks, set centralized color preferences, and even upload your photos to Adobe Stock.
The lightweight and fast image browser and viewer for Mac OS X. Lyn natively supports all popular image formats like JPEG, TIFF, JPEG 2000, PNG, TGA, RAW, HDR, OpenEXR, PPM, animated GIF and any other image format supported by Mac OS X. Includes 15-day free trial.
Fileloupe is a lightweight, incredibly high performance media browser for macOS. You can quickly browse photos, watch videos, read PDFs and preview documents all within the same window. It's like the Finder's Quick Look window, only better.