2DL

Press ⌥⌘2 and type, or hold it and say it. Move the pointer into the notch and the launcher opens; move away and it tucks back in. There is no Dock icon.

It learns which apps you reach for at which hour, does quick maths and unit conversions in the same field, and recognises speech on the device. It started as Secret Menu, became Dynamic Duo, and is now Two Digit Launch.

It is headed for the Mac App Store and has not been released yet.