Piler

Email (IMAP/POP3), contacts and calendar server

IMAP and POP3 server written primarily with security in mind

File hosting and sharing solution primary for teams and organizations

IPv4 over DNS tunnel solution, enabling you to start up a socks5 proxy listener

Open source email alias solution to protect your email address. Comes with browser extensions and...

POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client...