I recommend Ring also! They are the first to have interest in presenting it to a free software-focused event (in this case, it was LibrePlanet 2016):
http://media.libreplanet.org/u/libreplanet/m/take-control-of-your-communication-with-ring/ ... By this I guess they do understand the difference between open source, and free software (although, last time I checked, Ring's entry on the Free Software Directory must yet be reviewed (and I'm trying to help with this one too, as I also do occasional reviews when I have time to)), see: http://directory.fsf.org/wiki/Ring
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