Terrific to see this.

There's been an explosion of research into routing algorithms in recent years, but no open-source implementations of many of the new algorithms. Contraction Hierarchies is the best represented (it's used by Graphhopper and OSRM, inter alia), and there are Customisable Contraction Hierarchies and Multi-Level Dijkstra implementations. But many of the new algorithms simply don't have any open-source code available yet.

ALT* (A*, Landmarks, Triangle inequality) is one of the most interesting algorithms and so it's great to finally see this open-source implementation.