It's biggest use is over the 900MHz "LoRa" (long range about 2-5km) and works well with a multitude of equipment.

I've got some HelTec devices which are sweet.

Meshtastic = nomadic and point-to-point comms with no middle hardware. Great for hiking in poor reception areas to keep in touch with friends. Supports 7 hops or nodes of indirect communication

Meshcore = good for building your own network backbone and extends further through I think 64 nodes. Better for static location and densely populated areas.

Both support encryption, use 900MHz spectrum (no HAM licenses necessary), and can be flashed on loads of hardware.

Reticulum looks to expands on both of those Pros https://www.reticulumnet.nl/en/comparison/

Sorry, I'm a huge nerd, this shit is great! I started using LoRa sensors at work to save on battery life, cost, and network infrastructure.