Sure, check out pgloader (this guy re-wrote a Python program into Common Lisp and wrote about the experience), the European Lisp Symposium ( http://www.european-lisp-symposium.org/content-programme-ful... ), it's used by Google (ITA, air fairing system), it was used by Naughty Dog for their PS1 and PS2 games (they still use Lisp for scripting), it's been used by NASA, DART ( https://en.wikipedia.org/wiki/Dynamic_Analysis_and_Replannin... ), Cyc, there's a European company I can't remember the name of that uses Common Lisp for its train scheduling system. There's this new Swedish music company that uses Common Lisp for their software.

If you want to see much used applications in the Common Lisp community then check out all of Edi Weitz' software http://weitz.de/

Most Common Lisp that you use is in stuff you don't see, there're no Ruby hipsters here.

EDIT: Oh, or why not something like StumpWm? Really, thre's a lot of cool Common Lisp software out there.