This is an extension to Archi that allows collaborative work on Archi through sharing and versioning of models in a Repository. It's a work in progress. It is based on the Grafico format but hides all the Git complexity.
You can download the latest binary release on the Archi Plug-ins page here. Follow the instructions there on how to install it and get started.
There is no formal roadmap for the moment, development is done through sprints that try to gradually improve the overall value of this plugin. Focus if currently on user experience and more features (like branches managemnet) will come after.
Here is a basic vision and principles guiding the work:
Archi® is a free, open source, cross-platform tool and editor to create ArchiMate models.
The Archi® modelling tool is targeted toward all levels of Enterprise Architects and Modellers. It provides a low cost to entry solution to users who may be making their first steps in the ArchiMate modelling language, or who are looking for a free, cross-platform ArchiMate modelling tool for their company or institution and wish to engage with the language within a TOGAF® or other Enterprise Architecture framework.
ArchiMate® is an open and independent Enterprise Architecture modelling language that supports the description, analysis and visualization of architecture within and across business domains. ArchiMate is one of the open standards hosted by The Open Group and is fully aligned with TOGAF®.
The Archi website is here: http://www.archimatetool.com