We've added Guile as a supported language for submissions on CodeEval.
GNU Guile is the preferred extension system for the GNU Project, which features an implementation of the Scheme programming language. Its first version was released in 1993. In addition to large parts of Scheme standards, Guile Scheme includes modularized extensions for many different programming tasks.
For extending programs, Guile offers "libguile" which allows the language to be embedded in other programs, and integrated closely through the C API; similarly, new types and subroutines defined through the C API can be made available as extensions to Guile itself.
Guile stands for the GNU Ubiquitous Intelligent Language for Extensions. It is used in programs like GnuCash and LilyPond.