PHPMail2Fax is a drop-in replacement for HylaFax's mail2fax written in PHP for the PHP CLI. It will support pdf and tiff and have the ability to handle MIME e-mail. All contributions are welcome.
VOCP is a complete messaging solution for voice modems, with voicemail, fax, email pager, DTMF commandshell and Text-to-Speech support, 3 GUIs and a web interface. Send and receive faxes and voicemail, listen to emails and execute programs on the host.