There are 2 repositories under ax25 topic.
Dire Wolf is a software "soundcard" AX.25 packet modem/TNC and APRS encoder/decoder. It can be used stand-alone to observe APRS traffic, as a tracker, digipeater, APRStt gateway, or Internet Gateway (IGate). For more information, look at the bottom 1/4 of this page and in https://github.com/wb2osz/direwolf/blob/dev/doc/README.md
📡 An AX.25 packet radio chat protocol with support for digital signatures and binary compression. Like IRC over radio waves.
Utilities for Packet Radio in Rust. AX.25 encoding/decoding and radio interfacing.
A modem/TNC to generate the AFSK audio tones for sending APRS messages using a Raspberry Pi Pico
AFSK 1200 X.25 APRS Modulator & Demodulator
Asynchronous AX.25 library using asyncio
Single sketch LoRa Arduino TNC KISS modem for APRS or AX.25 networks
This project will have the files for a Cube Sat Telemetry system Using Raspberry Pi Transmitter Board
Arduino Amateur Radio NRF24L01 2.4 GHz USB serial KISS TNC (terminal node controller) for AX25 packet networks
Arduino Micro LoRA/FSK USB KISS modem (for Linux AX.25, APRSDroid, Codec2Talkie) or standalone APRS AX.25 micro digirepeater
Generic AX.25 beacon packet generator library for APRS
AX.25 packet radio digipeater for linux
AX25 packet node in TypeScript
A software to use Radiometrix radio modules as network interfaces
An embedded OS for ham / amateur radio enthusiasts (packet, CW, APRS, etc)
Python-based AX.25 Messaging System (AMS) server and client tools
Simple Bluetooth low energy UART interface for KISS (APRS) TNC
barebones KISS implementation that I hacked AX.25 2.2 data link layer compliancy onto for (non-deployment) UHF satellite testing
Parsing AX.25 and APRS from raw audio in Python
Arduino UART KISS AFSK1200 TNC Modem