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

✈️ Multi-functional, compatible DIY general aviation proximity awareness system

This is a LoRa APRS iGate/Digi based on an ESP32

This is the Xastir APRS client repository.

Custom firmware for Vaisala RS41 and Graw DFM-17 radiosondes with support for amateur radio use. Ideal for tracking high-altitude balloons. Supported modes include APRS, Horus 4FSK mode, CATS, morse code (CW) and additional digital modes like WSPR and FT8 via Si5351.

aprsc, a core APRS-IS server

Ham Radio of Things (HRoT)

A lightweight APRS tracker for balloons

TNC for Raspberry Pi Pico

Terminal Node Controller (TNC) for ESP32

VP-Digi - a functional, cheap, easy to assemble and configure STM32-based APRS digipeater controller with built-in KISS modem.

Arctic Tracker on ESP32

A modem/TNC to generate the AFSK audio tones for sending APRS messages using a Raspberry Pi Pico

ESP8266 and BME280 sensor for a minimalist weather station to put on your terrace

Manually submit weather station information to the APRS-IS network.

Generic AX.25 beacon packet generator library for APRS

An open-source, modular, Arduino based tracking system with HAM radio based APRS and cellular data transmission capabilities.

Code for sending audio (APRS packets) over the HamWing using a low-pass-filtered PWM

For all SDState CubeSat / Rocket Stuff!