Davenport is a Java Servlet-based application providing WebDAV access to an entire SMB network. This enables users to connect to Windows and Samba shares via WebDAV clients such as Mac OS X, Windows Web Folders, etc. or any Web browser. Workgroups are browseable, and users are authenticated against a domain. WebDAV clients can upload, download, create directories, etc. Non-WebDAV clients (i.e., "normal" Web browsers) can also access the network of shares and download files. When run over HTTPS, this application provides a reasonably secure means of accessing an internal Windows/Samba network over the Internet without requiring a VPN.
exJello is a JavaMail provider that connects to a Microsoft Exchange server (actually, it uses the WebDAV interface exposed by Outlook Web Access). It is designed as a drop-in replacement for the standard POP3 and SMTP providers. This allows you to send and receive messages through your Exchange server in situations where a POP3/SMTP interface is not available (through a restrictive firewall, for example, or if your administrator simply does not provide a POP3 or SMTP gateway).