Eric Kidd writes:
Gwydion Dylan is a portable, optimizing Dylan compiler. It was
originally written by the Gwydion Group at CMU and is now
maintained by volunteers. Dylan is an object-oriented, dynamic
language with four goals: high performance, rapid prototyping, ease
of use, and seamless support for libraries written in C.
The current release is a “technology preview”. The compiler is
quite mature; the most inconvenient bugs have been stomped; and a
fair amount of documentation has been written. Realistically, 2.2
could be used for learning Dylan or building command-line
applications.
Gwydion Dylan 2.2 represents about nine months of work since
2.0. It is free software (a.k.a. “open source”).