There are news all over Internet about Microsoft spying on its Skype users.
You can read a lot like this
http://www.zdnet.com/is-microsoft-reading-your-skype-instant-messages-7000015388/
Whether the news is true or false, people use skype, because they do not
find a perfect alternative for it. We have Ekiga, When I tried last time,
it does not even established connection properly. Now I recently came
through Jitsi - A Free software under GPL which looks promising and
available cross-platform.
If this functions well, it has the potential to replace Skype, and I have
just installed it and will try and post my review on it sooner or later. If
this is worth, then we have to promote this tool as a community behind Free
Software and Open Source.
Jitsi Website - https://jitsi.org/
Source - https://github.com/jitsi/jitsi
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Thanks & Regards,
Prasanna Venkadesh.