WARNING: PROBABLY INSECURE
This is a version of drawterm (a program for connecting to Plan 9 systems) which runs in a webbrowser. To connect to the remote host, it uses Websockets, which means you need a proxy such as websockify.

Jsdrawterm is written in Javascript, but it uses a bunch of C libraries from Plan 9 (for crypto and drawing routines) which need to be compiled to Webassembly. Since the Javascript also deals with some of the crypto, it's probably horribly insecure and hackers will steal your cats.