Chez Scheme is both a programming language and an implementation of that
language, with supporting tools and documentation.

As a superset of the language described in the [Revised 6 Report on the
Algorithmic Language Scheme] (http://www.r6rs.org)(R6RS), Chez Scheme supports
all standard features of Scheme, including first-class procedures, proper
treatment of tail calls, continuations, user-defined records, libraries,
exceptions, and hygienic macro expansion.

Chez Scheme also includes extensive support for interfacing with C and other
languages, support for multiple threads possibly running on multiple cores,
non-blocking I/O, and many other features.
