SpaceLauncher allows you to quickly launch an app with Spacebar and a key on your keyboard.
Cerebro gives a touch competition to Alfred and Spotlight with its tons of features that help you be more productive and find and access things quicker on your computers.
Ulauncher is an app launcher for Linux. It can launch applications quickly and has many other features for Linux machines.
Many don’t like the default look of Windows desktop and Rainmeter is an app that helps you completely transform your desktop into something that it has never been with its huge number of skins.
Quicksilver is quick and fast launcher utility app for Mac OS X.