Additional information about Guaranį can be obtained in the Home Page of Guaranį, at the URL http://www.dcc.unicamp.br/ ~oliva/guarana/. The source code of its implementation atop of the Kaffe OpenVM, on-line documentation and full papers are available for download. MOLDS is currently in early design stage, but, when you read this paper, there may be updated information in the home page of Guaranį. Both Guaranį and MOLDS are Free Software, released under the GNU General Public License, but their specifications are open, so non-free clean-room implementations are possible.