The Amateur Radio Emergency Data Network is based on open-source software that runs on off the shelf hardware. Compared to the MESH networking we experimented with several years ago it has some great advantages, especially with the hardware capabilities. Some of the advantages over HSMM-MESH I see are.
A choice of 4 amateur radio bands 900MHz, 2.4GHz, 3GHz, 5.8GHz
Ability to run in amateur-only segments of the bands free of creating and receiving QRM from Wi-Fi networks
Built-in PoE (Power over Ethernet). So only 1 cable required.
Ruggedized hardware for mast-mounting. At these frequencies, good coaxial cable is very expensive. Mounting the entire device on the mast and powered over a single inexpensive Ethernet cable is a great advantage.
Ability to leverage old satellite dishes. Some models are designed to be mounted where you'd normally put the LNA provided high gain for low cost (some units is saw were $39 US).
The limitation, of course, is that these units are mostly line-of-sight (LoS). The MESH network (automatic relay between nodes) overcomes some of this limitation but point-to-point connections that are LoS are needed. This would generally mean mounting in a high location clear of obstructions.
This video clearly explains the technology, limitations, design considerations and use cases. At only 17m it's worth watching and food for thought.
If anyone is interested in experimenting with the technology let me know.