The oldest publicly released code of mine is SLIPShuttle, which provided pushbutton connecting to the internet on an Amiga (the cmdline interface was terrible). Written in AREXX https://aminet.net/comm/tcp/SLIPShuttle.lha
The second oldest was ringconnectd, which allows you to "ring knock" your (POTS connected) modem to make it connect to the internet and mail you your IP address. It was VERY handy while I was in college, and apparently it took off in Africa a few years later as their internet connectivity grew. https://www.ibiblio.org/pub/Linux/system/network/daemons/rin...