There are numerous occasions when you need to quickly show someone (or view yourself) a bunch of photos, be it your kid's pictures from a walk or images from your latest trip to Colorado. How to View Photos Quickly and Easily on Mac OS X.
Has a fullscreen-view and slideshow included. You can sort images by name, date, size and kind. It is capable of viewing and manipulating the common image file formats as BMP, TIFF, TARGA, GIF (animated), PNG, JPG, PICT, PDF, EPS, ICNS, JP2 etc. CocoViewX is an freeware Imagebrowser & Viewer for Mac OS X.