Looks like MIT Scheme (on which the ScmUtils system runs) still gets some regular maintainence releases, though I don't know how active development is these days:
Nope, that's just the 'intro to programming' class. The class for this book is "Classical Mechanics: A Computational Approach" (I think) and it's definitely still taught in Scheme.
While I'm glad to hear that, how does that work given that the students presumably won't have been taught Scheme from SCIP beforehand? Is it just a given that students taking the class learned Scheme on their own?
https://www.gnu.org/software/mit-scheme/ https://ftp.gnu.org/gnu/mit-scheme/stable.pkg/
Installation instructions for the ScmUtils package:
http://groups.csail.mit.edu/mac/users/gjs/6946/index.html
As far as I know, Gerry and Jack still teach the course every year (can someone currently at MIT verify?) and still use the system.