I believe some games companys use it. Naughty Dog of Uncharted and The Last of Us fame, being the most famous. I think they used it to create some game logic DSL or something of that sort.
I use it for a ton of pieces at work. I use R for the most part but for everything else I run Racket. I make reports with Scribble and make it into a scripting language for my file management. I also use it for making Reports and documentation with Scribble. https://plt.eecs.northwestern.edu/pkg-build/doc/scribble/ind...
Hacker News runs on Racket. :-)
wasn't HN in Arc?
And what is Arc in?
Ah, Arc, the No Man's Sky of Lisp derivatives
The CPython JIT/compiler is written in C. Does this mean that a Python program is then a C program?
Arc is not Racket.
I suppose the original poster could clarify whether they were interested primarily in examples of the Scheme-derivative language "Racket" being used in production, or in the system/VM/runtime "Racket" being used in production. Since Racket (the system) now makes it very easy to define new languages on top of it with the #lang keyword, it might be nice to get more clearly distinct terms for these. The way the Java world uses JVM vs. Java, e.g. you'd say that a Clojure app runs "on the JVM", but it's not in Java.
John Carmack is pushing for Racket at Facebook/Oculus