Route66 is a partial implementation of IBM's TN3270 protocol. It is a web based IBM 3270 terminal emulator written in C#. It requires a 3270 service to provide a Telnet endpoint.
The back-end service itself is meant to be hosted on your favorite provider that can run .NET applications. This project includes a Blazor front end that you can use either as is or as a reference implementation of a front end you'd like to build yourself. Reference implementations in other front end platforms are a work in progress.
The web styling is purposefully very austere. It is open to styling as you see fit.
The root page of the project launches a simple connection html form that allows you to enter a telnet host address and port to connect to.