High Quality Content by WIKIPEDIA articles! Quicksilver is a computer utility software program for Mac OS X, originally developed by Blacktree Software and distributed freely. It is essentially a graphical shell for the Mac OS X operating system, allowing users to use the keyboard to rapidly perform tasks such as launching applications, manipulating files, or sending e-mail. It is similar to the Mac OS X applications LaunchBar and Alfred, but uses a different interaction paradigm. Although feature rich and somewhat complex, Quicksilver is based on a simple three-panel interface.