Quicksilver is a unified, extensible interface for working with applications, contacts, music, and other data – for the Mac.
Not in the Top 100 in 2013
Comments from some of those who selected Quicksilver as one of their Top Tools
“a Mac only onboard tool which makes it a snap to find open and work on anything on the computer. Keyboard driven. Free” Kate Foy
“The Swiss Army knife of Mac applications, Quicksilver locates files ala Spotlight, launches applications, performs simple manipulations on files, controls iTunes, and much much more. There’s a rumor going around that Blacktree is going to stop development of Quicksilver, and the most recent release seems very buggy when running under Leopard. But it’s still a sine qua non among Mac apps.” Robert Talbert