Picasa

Picasa is a photo editing program, offered as a free download by Google. For more details, picasa.com and picasa.google.com will both get you to the same place. :) Picasa is just a really basic program, but it's free, easy to work in, and somewhere to start if you're looking into photo editing for the first time. Besides offering basics such as cropping, brightness-contrast, and recoloring capabilities, Picasa lets you create an image housing thumbnails of all of the images in a given file on your computer. To me, this is by-and-large its most remarkable feature.

Details: I condensed this file, but as offered by Picasa, the image is actually large enough to clearly see each thumbnail. Cheers to Google for Picasa! :)