IrfanView - IrfanView ... one of the most popular viewers worldwide.
Retrobatch - Retrobatch is a unique application for automating actions to tens, hundreds, and even thousands of images at the same time
ImageGlass - You can use Image to view your digital images and photos of many different formats.
photos2webgallery - Create lovely web galleries directly from macOS Photos app.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
FastPictureViewer - A hardware-accelerated image viewer for the modern Windows platform.