WidsMob Viewer is an excellent photo viewing software with super fast speed and excellent experience. There are different viewing mode to check thumbnails, full pictures, slideshows, and even manage the photos.
AutoMe is a reliable and user-friendly windows automation software and macro recorder with task scheduler, color checker. AutoMe is very easy to use, you can record robot, and run it as many time as needed. No programing needed.
All round photo browser support both JPEG and RAW formats. You can access to photos within the same folder within one click, or manage the photos between different folders. Select photos from multiple folders to make a slideshow is not a problem. What is more, you can adjust the various photos effects, batch resize, rename, and even convert photos within the program. It should be the most efficient photo viewer for Mac.