--Under development now is a brand-new TCP/IP and suite of Internet applications for the classic Macintosh of the 1980s and 1990s: Telnet, Email, FTP, and HTTP.
The goal here is connectivity to the modern Internet for all classic Macs. All applications are designed to work on any Mac with traditional serial ports: the original Mac 128K all the way to a Power Macintosh with Mac OS 9.
Why should you care? There is already TCP/IP and applications for the newer classic Macs, but there is no more active development and these applications are frozen in time. They do not support new features, new developments, or TLS encryption.
When complete, the Sabina TCP project will give any classic Mac with serial ports access to modern Email, FTP, Telnet, and Web applications.
The Sabina TCP project is the world's largest classic Mac development project today, and is still a work in progress. Learn more at the Sabina web site. Do a web search to find it.
Progress is here: https://macgui.com/sabina