tavon.org

Shriram Krishnamurthi's book on Programming Languages

DrScheme is a superbly
designed programming environment for a family of implementations of the Scheme programming language. Combined
with a great, freely available textbook, How To Design Programs which lays
emphasis on the program design process rather than on finer

The book was written by members of the PLT Scheme team, a group of (mostly) academics who have also created the PLT Scheme family of Scheme implementations.