Language Details: Racket

Racket (formerly named PLT Scheme) is a general purpose, multi-paradigm programming language in the Lisp/Scheme family

Racket article on Wikipedia (see also: official website)
Code Jam 2011 Contestants using Racket
Qualification Round
Used in 12 solutions by 3 contestants:
Round 1C
Used in 1 solutions by 1 contestants:

Submission Origin

Lebanon (1 contestant)
Russia (1 contestant)
Turkey (1 contestant)