If you are looking for an alternative for [Quicksilver](http://www.blacktree.com/), the popular OSX launcher, you might find [Found](https://itunes.apple.com/us/app/found/id527134927?mt=12) (no pun intended) a suitable replacement.

To be honest it does not seem to be quite as powerful but, if - like me - you only use Quicksilver to launch apps, then Found is a great lightweight (and beautiful) alternative.