Spect - Fast image browser and organizer for macOS
Quickly open folders containing thousands of images, even from a network drive.Browse just top-level folders, or deep scan into sub-folders.
Use your existing filesystem storage; no importing, no separate catalog or library files.
Prune images with marquee selection and delete.
Slideshow and shuffled slideshow.
Drag and drop and more!
http://stevenf.com/spect/