Dire Wolf is a software „soundcard“ AX.25 packet modem/TNC and APRS encoder/decoder by WB2OSZ. It can be used stand-alone to observe APRS traffic, as a tracker, digipeater, APRStt gateway, or Internet Gateway (IGate). For more information, look in https://github.com/wb2osz/direwolf/blob/dev/doc/README.md
Direwolf