Good starting point...
http://www.diychristmas.org/wiki/index.php?title=Building_an_Octoscroller_Matrix_Display
From what I've seen so far... easiest, simplest setup has been a Beagle Bone Black with an octoscroller running FPP. You use xLights to sequence, but run it from FPP/BBB.
I just ordered a whole setup from diyledexpress during their pre-sale... 6 panels, BBB, connectors, power supply, etc.