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It includes implementations of most features found in traditional Scheme (e.g., definitions, let, let*, letrec, if, cond, lambda, lists) with a very similar syntax. Because it's implemented in Java, we use long and double types to represent numbers, e.g., 2/3 does not have an exact representation.
Simple Scheme also includes an implementation of image functions similar to Racket's image module (http://docs.racket-lang.org/teachpack/2htdpimage.html).
See http://bryanchadwick.com/simplescheme/ for documentation and examples.