GNU/consensus/Tox
From LibrePlanet
Tox
Tox is a peer-to-peer GPLv3 application and protocol that aims to replace Skype.
It features audio and video calls, an rich chat with integrated file-sharing, group chat, screen-sharing (or more exactly "screen-showing"), and Tor support.
Debugging
Get the debugging build for your platform (e.g.for x86_64) and run it with `gdb`.