Faxy is a lightweight php based web frontend for Hylafax fax server that doesn't need a db to run, you just edit config.php file and you're set! Multilanguage support via .po/.mo files in wordpress style (some wordpress code used)
HylafaxManager - Windows/Linux client for Hylafax Server(Fax Server for *nix)
The pre-requisit to use is have a Hylafax Server installed on network.
See project page for more details.