!ownCloud does have groups. But in addition to the !FreeSoftware version at http://owncloud.org there's an Enterprise version at http://owncloud.com — I haven't tried that one, and don't know what the difference is, or if the Enterprise version is FAIF. But you should try that to see if it's a better fit.

!ownCloud does have groups. But in addition to the !FreeSoftware version at http://owncloud.org there's an Enterprise version at http://owncloud.com — I haven't tried that one, and don't know what the difference is, or if the Enterprise version is FAIF. But you should try that to see if it's a better fit.