Chez Scheme(tm) is a complete high-performance implementation of ANSI/IEEE standard Scheme, with a fast incremental compiler, an efficient run-time system, an extensive run-time library, and a productivity-enhancing program development environment. Chez Scheme was first introduced in 1985 and is now in its sixth major release. Chez Scheme is distributed by Cadence Research Systems.
More information on Chez Scheme is available at www.scheme.com. Free software and documentation related to Chez Scheme can be found here or at www.scheme.com.