LaunchBar
www.obdev.at/products/launchbar/index.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
LaunchBar is an award winning productivity utility that provides instant access to your applications, documents, contacts and bookmarks, to your music library, to search engines and more, just by entering short abbreviations of the searched item's name.