Works well This works quite well and is lightweight on the phone. I've installed the server on Ubuntu 12.04 with no trouble  although some fiddling needs to be done if you want the notifications to properly appear on a Gnome desktop (upper right corner with the rest of them). ** In answer to yycode: I had to install a Gnome extension to get the notifications to display in the upper right hand corner. I don't think it's anything you can control with the way Gnome is currently set up.
April 13 2014