From:https://www.userful.com/videowall

Userful turns a standard PC into a flexible and powerful video wall controller that delivers visually 
stunning video wall displays over the network with unparalleled simplicity and ease, at an affordable 
price. With Userful you can:
Deliver any layout including one of a kind artistic or mosaic-style video walls
With up to 8k source content in real time on up to 100 displays per video wall
All easily managed from a browser or smart phone