ttyd VS shellinabox

I do everything through a web browser -- I run an Arch VM with a modified version of ttyd running as a systemd service.

This is the way, why need something else? And Its already preinstaled in windows. But there is still a thing for web browser https://github.com/tsl0922/ttyd

https://github.com/tsl0922/ttyd should do the trick!

there is ttyd

There are programs like gotty that can show terminal output in a webpage. Some alternatives, https://alternativeto.net/software/gotty/ Like ttyd looks promising as well.

Is it an alternative to shellinabox ?

https://github.com/shellinabox/shellinabox

Shell In A Box (though it hasn't been updated in a few years)

Remind me of ShellInABox, but Apache Guacamole is probably much better supported.

From the GitHub community, nyxnor did an amazing work to rewrite the support of bridges with pluggable transports (OBFS4, MEEK-AZURE and SNOWFLAKE) to make it easier than ever to circumvent censorship. Also, we experimentally added „Shellinabox“ so that user, who are not familiar with SSH can also access the TorBox Main menu with a web browser. However, we are not completely satisfied with that solution yet because browsers are showing warning messages with the self-signed certificate for a secure connection. We are eager to hear your feedback on “Shellinabox”. Do you know better alternatives? For more details about the latest TorBox Version, check out our Blog Post.

shellinabox — A web-based SSH Terminal https://github.com/shellinabox/shellinabox

It's also possible ports 80/443 are also available to your Windows machine. In which case you might use your NoMachine service to listen on that port. If the firewall is not permissive enough, you can use something like shellinabox to HTTP into the Windows machine and perform administration tasks to disable RDP/endable NoMachine on port 3389.

It looks like Telehack is running a Javascript + CSS kit called ShellInABox to allow web browsers to connect via Telnet. The link they provided in the "about" leads to a malfunctioning webpage, looks to be last updated in 2010. However, that project was forked on GitHub, and the most recent update appears to be Jan 2019, so there is a likely-working copy of that software for allowing for that kind of access.