After a long wait period, the version 2.0 of MIX (a.k.a Plain MIX), is available for download from ftp://download.gnu.org.ua/pub/release/mix. This is a major release of the project, containing lots of improvements. In particular, it offers much more effective and convenient debugger.
For a complete list of changes, see http://svn.gnu.org.ua/viewvc/mix/trunk/NEWS?revision=160&view=markup
A complete documentation in various formats is available online from http://puszcza.gnu.org.ua/software/mix/manual.
The project has switched to the SVN repository. Please see http://puszcza.gnu.org.ua/svn/?group=mix, for more information on how to access it.