Mac OS X only: Rename large groups of files—like that batch of photos fresh off your camera’s memory card—using simple or complex rules with Name Mangler. Simple options include numbering files sequentially, adding a prefix or suffix, or changing case. In advanced mode, you can script any number of those actions and save them. Name Mangler also produces reusable droplets you can add to Finder; then, whenever you want to batch rename a set of files, simply drag them onto the droplet without even starting up the application. Name Mangler is a free download, donations requested, for Macs running Leopard only.