Quicksilver is a fast and free Mac OS X productivity application that gives you the power to control your Mac quickly and elegantly. Quicksilver learns your habits, making your everyday chores simple and efficient.
Quicksilver is a launcher utility app for Mac OS X which gives you the ability to perform common, every-day tasks rapidly and without thought. An introduction to Quicksilver's abilities include:
Accessing applications, documents, contacts, music and much, much more.
Browsing your Mac's filesystem elegantly using keywords and 'fuzzy' matching.
Managing content through drag and drop, or grabbing selected content directly.
Interacting with installed applications through plugins.