If you used to be a windows user, and now switch to Mac OS, I'm sure you will miss the good and free Image Viewer program on window. They are simple, clean and you can do some basic photo editing with it easily.
And this list collects the Top 5 Free Image Viewer for Mac OS. If you think they are useful, please recommend them to your friend. Xee Xee is an streamlined and convenient image viewer and browser. It is similar to Mac OS X's Preview.app, but lets you easily browse the entire contents of folders and archives, move and copy image files quickly, and supports many more image formats. Xee for Mac features a neat and clean, typical interface for image browsers. All options are easily located within a well-organized menu.
In the Preferences menu the user can view and set up keyboard shortcuts for many options as well as select supported formats. Users can also organize their images as they view them with options to copy, move, rename, and delete files. Users can quickly view some important data regarding the image displayed, such as image width and height, file and color format, resolution, etc. Similar info can also be viewed in the status bar. Additionally, this image browser lets users browse inside compressed archives, which is a nice feature. (Review from Cnet Editor) Xsee Xsee is an image browser and viewer, developed in Cocoa, with a beautiful Aqua interface. Supporting gif, jpeg, tiff, png, icons and more, full drag and drop interface, built-in tools for renaming files, convert images, create thumbnails.
For example, to use the F12 key to change your volume, you would press FN+F12. Just press the FN key. If a function key doesn't work as you expect it to, press the FN key in addition to the function key. 
Integrated slide show for viewing images in window or full screen, customizable toolbar, full support for mouse or keyboard navigation and much more. GIMP GIMP is a free, open source tool that lets you create and edit images. GIMP has been around for over two decades and development has been stable over the years. The newest update for GIMP gives a slew of new features and a glimpse into the future for this incredible open source image editor. All the features of GIMP are still present. You can create your own images with tools for airbrushing, penciling, cloning, and creating gradients. Power users can create their own brushes and patterns to use later.
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GIMP also allows users to manipulate images imported into the program. You can crop, add text, resize, and create nested layers. There is even a way to animate your creations.
The Gimp for Mac interface opens with a folder and file directory tree in the left pane, a set of thumbnail images in the middle pane, and a set of command icons and options across the top, right side, and bottom of the window. Once you select an image it is blown to full size and you can then use the comprehensive set of manipulation and touchup tools to alter the image and resave it. Learning the full power of Gimp for Mac will take months, but basic manipulation can be done in a few minutes once you figure out where the tools you need are. (Review from Cnet Editor) Seashore Seashore is an open source image editor for Cocoa.
It features gradients, textures and anti-aliasing for both text and brush strokes. It supports multiple layers and alpha channel editing. It is based around the GIMP's technology and uses the same native file format.