The following individuals contributed to the implementation and documentation of SICP language:
Abelson & Sussman wrote Structure and Interpretation of Computer Programs.
Daniel Coore designed and implemented the original image display code in MIT Scheme.
Mike Sperber ported the code to PLT Scheme / Racket.
Neil Van Dyke maintained the original SICP language package for years.
Dorai Sitaram implemented the initial version of amb in his Teach Yourself Scheme in Fixnum Days.
Javier Olaechea fixed bugs in amb.
Leif Andersen fixed several packaging configuration mistakes.
Ed Moore fixed a missing function.
Chuan Wei Foo improved the README file.
Graeme McCutcheon fixed a typo.
Huma Zafar updated the documentation to match the new picture language implementation.
Pavan Maddamsetti implemented the missing random function.
Jiezhe Wang fixed the top-level printing so that mutable pairs are displayed similar to r5rs.
Sorawee Porncharoenwase is a current maintainer of the package.
Jens Axel Søgaard is a current maintainer of the package, implementing the picture language and maintaining the package for years.