This blog runs code written in Clojure and hosted on App Engine. The source is available on Github.
In addition to implementing the blog application, I also wrote a small web application framework in Clojure. The framework includes request routing, XSRF protection, automatic code reloading, utilities for working with the App Engine datastore, a domain-specific language for generating HTML and more.
I recommend Clojure. I found the language practical and fun to use.
Here's a promotional video for a product that I worked on twenty years ago, the Aries Technology ConceptStation. The ConceptStation was a mechanical computer aided engineering workstation based on the IBM PC AT.
I primarily worked on the finite element modeling software which can be seen starting at 7:14 in the video.