Franz is a free messaging app / former Emperor of Austria and combines chat & messaging services into one application. http://meetfranz.com/
$ docker build -t lvthillo/franz .
$ docker run -d \
--net host \
--cpuset-cpus 0 \
--memory 512mb \
-v /tmp/.X11-unix:/tmp/.X11-unix \
-e DISPLAY=unix:0 \
--device /dev/snd \
-v /dev/shm:/dev/shm \
lvthillo/franz