Quicksilver is a program, quite similar to Butler and LaunchBar, for launching applications and finding files quickly under OS X. Quicksilver is free, open source, looks good, and it seems to be very responsive.

Quicksilver is a program, quite similar to Butler and LaunchBar, for launching applications and finding files quickly under OS X. Quicksilver is free, open source, looks good, and it seems to be very responsive.