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.
OpenSubsystems is set of business components such as security, search, inventory management, able to run on various J2EE servers or just using JVM thanks to unique middleware abstraction layer and repository of common application functionality patterns
mimx is an open-source, drop-in replacement for corporate communication servers such as Microsoft Exchange and Lotus Notes. mimx provides e-mail, chat, fax, network news, calendaring, etc. to clients such as Microsoft Outlook.