Turn your Android phone into Amateur Radio Codec2/OPUS APRS enabled DV handheld transceiver (Bluetooth/BLE/USB/TCPIP KISS/Sound modem client for DV digital voice communication)

M17 standard specification

ESP32 based Codec2/OPUS DV hobby UHF handheld transceiver aka walkie-talkie

Codec2 low bit rate audio codec Arduino library for ESP32

Standalone M17 Project Voice and Data Packet Encoder and Decoder

A wxWidget free port of ircddbGateway with some more (not yet all implemented) features ;)

M17 C library

Use a FreeDV modem and amateur radio HF transceiver from a Discord voice call!

The host program for the MMDVM and MMDVM_HS

Converts a .vcf export from Google Contacts into a format that can be imported into a BT Smart Hub 2 for use with BT Digital Voice phones