Best in class...

I have been using the freeware version of Xee every day, many times a day, for years. Fast, versatile, reliable, smart and succinct in design. It’s such a basic part of my workflow that I was excited just to discover there is a (very reasonably-, even under-priced) paid app.

KevinTaylorMcCauley about Xee³: Image Viewer and Browser