See _("David Krauss's home page"|http://homepage.mac.com/potswa/) which links to _(http://uppermute.org), at last up and running (previous http://www.rebelution.net/upper/ and _("google's cached page"|http://www.google.com/search?btnG=goo&q=site%3Arebelution.net+upper) seem to work no longer).

<p><span class="comment">From the author:</span> <strong>Upper</strong> is a framework for extensible modular optimizing compilers. It will allow language designers to expose the internal module interface through the language, allowing reflectivity. It's also a complete departure from traditional compiler architecture, making heavy use of object-oriented design. <strong>Mute</strong> will be the extensible *(programming language) built to be compiled by Upper. It will be flexible enough to emulate C, C++, etc.