Here are the one I know of (there are doubtless others to be found):- NAS options :- OpenFiler (based on rPath) SME Server (based on CentOS) The next two have NAS, facility but can also act as Firewall/Router/Mail Server/Web Server etcetera :- ClearOS used to be called ClarkConnect (based on Centos) eBox (based on Ubuntu LTS (currently 8.04))