Can you explain why tox is written in C over languages?
In my experience this shows that people actually care about the tech they work with. Which is a good sign.
Rather than ricers with -Ofast kernels and overclocked CPUs it would be nice if a mature team focused on security and correctness first.
Like cryptocat, tox claims things that are not proven to be true by developers that aren't qualified to be writing or designing the protocols for a secure encrypted chat.
Having the intent to do something isn't the same thing as actually being able to do it. People will use tox and get p3wnd with very dire consequences.