SpaceLauncher lets you launch or switch to an app by holding down the spacebar while pressing a key.

• Launch an app, open a website, or run a script:
• Spacebar S -> launch Safari
• Spacebar N -> launch Notes
• Spacebar G -> open a website
• Simulate a keystroke (with/without modifiers):
• Spacebar Q -> simulate F11
• Spacebar X -> simulate Control-Option-Shift-Command-A
• More keys, more actions:
• Spacebar F then D -> open Documents folder
• Spacebar F then W -> open Downloads folder
• Spacebar A W E S O M E -> launch your AppleScript to say "you are awesome"