Cowrie SSH/Telnet Honeypot https://docs.cowrie.org/

This is an easy to use telnet client module to interact with a remote system smoothly over this protocol! It is a very minimalistic alterative to "telnetlib".

A very simple telnet honeypot

Pothead: A simple lightweight packet for creating a minimal interaction honeypot

Simple to use Telnet honeypot.

Telnet snake game (and honeypot)