Ah, I see 
rooExtend is a ready to run SD-Card image with preinstalled Roon Bridge, REM and some commercial Roon Extensions I provide. You also can connect a HDMI TV to display Roon artwork.
REM, Roon Bridge and TV output can be used for free. The Roon Extensions I provide need a License Key.
For more information please visit http://diy.rooExtend.com and also this thread for general questions.
Each of my Roon Extensions also has separate thread you cannfind if youn
search the forum for rooExtend.
Best DrCWO