Tox

Tox, the distributed instant messaging program, just got a new GUI client that is written in PURE C WITHOUT ANY DIRTY TOOLKITS. Calls Xlib and the win32 api directly.

Pretty interesting.

https://github.com/notsecure/uTox

>>6
Well, we have to support X for *Linux, *BSD, etc.
And when Wayland becomes more popular, support for it can be added pretty quickly.
The code is entirely portable, with folders for different windowing systems support (win32 and xlib folders). Adding wayland support should take no more than a week, if it's ever needed.