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For the curious and the enthusiasts, Beta 2 version

Ring is free software for universal communication which respects freedoms and privacy of its users.

Ring
GNU/Linux
GNU/Linux 1
Windows
Windows 1
Android
Android 1
Android
Android 2
Android
Android 3
macOS
macOS 1

The systems presented above, other than GNU/Linux, are deprecated by the Free Software community, due to a grave ethical flaw. For more information:

 

Ring (formerly SFLphone) is free distributed multimedia communication software published under the GNU General Public License 3. It is developed by Savoir-faire Linux with the help of a global community of users and contributors. Savoir-faire Linux is a Canadian company specialized in Linux and free software.