IrfanView. This is a free image viewing program I have been using for a very long time. I mainly use it to crop and resize images and to batch convert one image form to another. Many image types are supported, too many to list. Apparently you can also create slideshows and use it as a multimedia player. Great product and it’s free.
Here’s a tip. See an image you like? Ctrl+prt screen will copy into memory the active window. Ctrl+V into IrfanView. will paste the active screen, allowing you to save or crop & edit as you wish.