Alternative IM/VoIP solution?

If anyone knows of a instant messaging and VoIP solution that’s free, privacy friendly (end-to-end encryption, preferably) and, most importantly, easy to get the “average Joe” to switch to (i.e. my non-technical friends), please let me know. Bonus points if it has interoperability to work with other systems (at the eventual cost of losing some of the privacy) – that way, I wouldn’t need to get all my friends to switch.

(Of course, Google Talks/Hangouts, Skype and anything Facebook-related is out of the equation.)

Another thing I’m looking forward to is having my computers (Linux and Windows), old Windows Mobile phones and my Android phone and tablet synchronized (contacts, calendar, email) through the Internet without Google’s help, but I realize this is even harder find than the IM solution I specified above.

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