RadioLib
A universal wireless-communication library for embedded devices that supports many radio modules and digital modes such as LoRa, RTTY, AX.25, and SSTV through one consistent interface.
RadioLib lets an embedded project integrate many different wireless communication modules, protocols, and digital modes into a single consistent system, covering LoRa, FSK/OOK, GFSK, and other radio families such as SX126x, SX127x, SX128x, RFM9x, CC1101, and nRF24L01, as well as integrated microcontroller/LoRa modules such as the STM32WL. On top of these modules it implements digital modes including AX.25 packet radio, RTTY, Morse code, SSTV, and ADS-B.
It natively supports the Arduino ecosystem, including ESP32 and ESP8266, but can also run in non-Arduino environments. Documentation includes a wiki, an FAQ, an automatically generated API reference, and decoders for the status and debug-log codes RadioLib methods return. It is written in C++ and MIT licensed.