Summary of what Arcan is, from https://arcan-fe.com/2018/05/31/revisiting-the-arcan-project...

> Arcan is a curious blend of a streaming multimedia processor, game engine and display server with a novel design that lends itself well for both complex and simple realtime interactive graphics projects alike, and goes well with anything from Sci-Fi UIs for some homegrown embedded project to full blown desktops. It is highly modular, low on dependencies, yet comes with all necessary batteries included.