Albert alternative to OS-X spotlight created by Manuel, it offers pretty much same features like Spotlight or maybe better than Spotlight. It is a selection-based search system, which creates an index of all items and files on the system.
It is designed to allow the user to quickly locate a wide variety of items on the computer, including documents, pictures, music, applications, and System Preferences. You can set custom hotkey and modify search criteria for albert.
After installation you can open Albert from Menu/Dash, and first set hotkey to activate albert.