For the desktop: - Tor - Bitmessage Bitmessage is specially interesting because it's not only encrypted and private, it actually solves the problem of spam a

For the desktop: - Tor - Bitmessage Bitmessage is specially interesting because it's not only encrypted and private, it actually solves the problem of spam and offers 3 kinds of messaging under the same interface: email-like, broadcast messages ala Twitter and chan boards.