Yes. While initiated by the Auto-ID Lab at ETH Zurich/University St. Gallen and the Distributed Systems Group at ETH Zurich, it is open for participation by everyone.
First, you should read the user guide. If you can't find the information you are looking for you should check the mailing list archive and, as a last resort, you can post your question to the mailing list.
You can easily add these features to an Fosstrak-based EPCIS installation by setting up an instance of the Apache Webserver as a proxy and using Apache's authentication mechanisms.
The database backend officially supported by Fosstrak EPCIS is MySQL. However,
Thomas Rudfoss wrote a very nice tutorial
on how to run Fosstrak EPCIS on top of PostgreSQL or Oracle. Stephen Tan also provided some great
hints
on how to use Fosstrak EPCIS with Microsoft SQL Server.