Quicksilver is a utility app for macOS. Originally developed as proprietary freeware by Nicholas Jitkoff of Blacktree, Inc., it is now an open-source project hosted on GitHub.
Quicksilver is essentially a graphical shell for the macOS operating system, allowing users to use the keyboard to rapidly perform tasks such as launching other apps, manipulating files, or sending e-mail. It is similar to the macOS applications LaunchBar and Alfred, but uses a different interaction paradigm. Because of its flexible interface and extensibility, Quicksilver has been called one of the top productivity applications on the Mac.
