Finder

Website/Download: http://www.apple.com/macosx/features/finder.html
License: Freeware
OS: Mac
Latest Version: 10.6
Publisher's description:
The Finder is the default application program used on the Mac OS and Mac OS X operating systems that is responsible for the overall user-management of files, disks, network volumes and the launching of other applications. As such the Finder acts like the shell on other operating systems, but using a graphical user interface. It was introduced with the very first Macintosh computer, and also existed as part of GS/OS on the Apple IIGS. It underwent a complete rewrite with Apple's switch to a UNIX-based OS in Mac OS X.