A free smoking Quicksilver interface
Version: 0.9The first ever third-party Quicksilver interface. Completely customizable. Includes Disco-style smoke functionality (non-smoking version available).
Operating System: Mac OS X
The smoke effect comes courtesy of the application Disco, which includes a framework that enables real-time visualization and computation of smoke. Practicality-wise, it's pointless, but it's certainly very amusing.
Smoke can be turned on or off at any time by pressing Cmd-S when Fumo is activated.