Harris Computer Systems
libschemelibrary makes the Scheme language available as a C library. Its interface is through a single C header file and it is easily extended with new primitive procedures, new primitive types, and new syntax. It is portable to any system that has an ANSI C compiler and to which Hans Boehm's popular conservative garbage collector  has been ported. It has been used to build a variety of special purpose data manipulation tools, and as an extension language for an ethernet monitor.