Meshtastic: Text message mesh network using LoRa modems.

Reticulum: full network stack (alternative to IP), mesh, focus on low-speed, unreliable connections. Transport layer agnostic. Current 'Hardware drivers' are written for LoRa, Internet Tunnels, Wifi, Amateur radio.

Reticulum sounds great? It is, but still has 2 problems: 1. The only complete & stable implementation is written in Python and 2. The existing end-user applications have confusing and complex UIs (except for the command-line tools for remote shell and file copy).