Yal

Yal can help you speed up the way you interact with your Windows based PC. You can easily access your favorite programs, documents, even browser bookmarks. You don't even have to type their full name. Yal can usually tell what you actually want, without expecting many input characters. There's also TAB completion that could come handy in some cases.

The more you use Yal, the better it gets. It keeps count of the keywords you enter and the entries you execute, thus it will always give you the best possible suggestions.

You can also perform simple math calculations, access your clipboard's history, termitate processes, you can quickly switch between opened windows, perform searches using your favourite search engines...and more to come.