From Phil Beauvoir:
Archi Portable is a free, open source, cross-platform tool and editor to create ArchiMate models. Archi Portable is targeted toward all levels of Enterprise Architects and Enterprise Modellers. It is intended to provide a low cost to solution to users who may be making their first steps in the ArchiMate language or who are looking for a cross-platform ArchiMate modelling tool for their company or institution. Archi Portable fulfills the needs of most Enterprise Architects and associated stakeholders, but it can also be regarded as an introductory ArchiMate tool for those wishing to engage with the language before committing to a commercial solution. This is a zip file that does not use an installer and does not add ".archimate" file associations.