Popularity is not the correct measure stick.<p>Lisp is more like research language than implementation language for bean counting apps. Better question is what bleeding edge things have originated, are being done or have been done in Lisp.<p>John Carmak is doing VR research with Racket.<p>Christian Schafmeister doing molecular metaprogramming.<p>Raytheon implemented a signal processing analysis pipeline for missile defense in Lisp<p>Commercial Lisp vendors keep lists of some of their customers. Specialized Cad programs like Bentley PlantWise are not popular but they are very complex.<p><a href="http:&#x2F;&#x2F;franz.com&#x2F;success&#x2F;" rel="nofollow">http:&#x2F;&#x2F;franz.com&#x2F;success&#x2F;</a><p><a href="http:&#x2F;&#x2F;www.lispworks.com&#x2F;success-stories&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.lispworks.com&#x2F;success-stories&#x2F;</a>