I'm a little confused as to what this actually is.

Is this a route planning built on top of OSM? Does this bundle OSM data "all in one" so that you can more easily host an OSM server?

> Self-hostable maps stack, powered by OpenStreetMap.

In addition to listing out some of the required specs (for a localized area) [1]:

> ... generation ... needs ... 8GB of memory ... running ... around 4GB ...

> ... recommend ... 50GB ... disk space

[0] https://github.com/headwaymaps/headway

[1] https://github.com/headwaymaps/headway#system-requirements