Software
https://www.qsl.net/sm3gsj/gcm.htm
Linux:
https://hamwaves.com/linux.ham/en/index.html
https://www.pcworld.com/article/427298/how-to-get-started-with-linux-a-beginners-guide.html
https://sourceforge.net/projects/kb1oiq-andysham/
https://wiki.ubuntu.com/UbuntuHamsPackages
https://tldp.org/HOWTO/AX25-HOWTO/index.html
https://www.complete.org/linux-packet-radio/
https://tldp.org/HOWTO/pdf/AX25-HOWTO.pdf
https://www.linuxdoc.org/HOWTO/AX25-HOWTO/
http://www.trinityos.com/HAM/CentosDigitalModes/hampacketizing-centos.html
https://marc.storck.lu/blog/2013/08/howto-setup-an-amprnet-gateway-on-linux/
https://nl3asd.tripod.com/index.html
https://www.youtube.com/watch?v=a1bf10lAtD8
https://www.superpacket.org/n8gnj_dcc_2022_final_for_web.pdf