xrandremote 
remote screens seamlessly
An indicator applet for connecting to remote screens.
Still in development. Does not work at the moment.
Currently it supports:
- chromecast
- dlna servers (like kodi)
It is packaged as an indicator for ubuntu and you can install it with the following:
$ sudo apt-add-repository ppa:lutostag/xrandremote
$ sudo apt update
$ sudo apt install xrandremote
run it simply with:
$ xrandremote