My craft + tech startup www.youpatch.com uses Racket for the clever bits: image-processing, pdf generation, and I find it's great for prototyping and R&D. Here's my talk wide-ranging talk about it (video and slides) http://agile-jitsu.blogspot.com.au/2015/01/my-talk-at-racket...

Also at RacketCon 2014 Brian Masterbrook talked about using Racket at www.airstash.com for testing hardware: links at con.racket-lang.org