Desktop Client for Raspbian Jessie

I’m enjoying the Windows Desktop Client with my NC Box. Great notification tray messages across my accounts on multiple Windows desktops instantly. After a few self-inflicted challenges, I was able to regroup using advice from the forum. The Ubuntu client works fine too for me.

Is there a Raspbian Jessie client? I could not add PPA since add-apt-repository is not supported in Jessie. Is the manual method to add PPA the only solution for RPi boards that run Jessie:
deb jessie main
deb-src jessie main

I do not want to embark on this without a reassurance that this is indeed the right way to proceed.