SICS
Second Interpreter of Scheme Code is an extensible Java based interpreter of the algorithmic language Scheme. SISC uses modern interpretation techniques, and handily outperforms all existing JVM interpreters (often by more than an order of magnitude). In addition, SISC is a complete implementation of the language. The entire R5RS Scheme standard is supported, no exceptions.
(追記) (追記ここまで)
License
GNU General Public License (GPL)