Official Website Down
The official site is down right now, looks like ERR_NAME_NOT_RESOLVED. Confirmed on IsItDown as well.
Still down a year later
If you really need it, they have a project here that defines it and has instructions on building locally.
But seems the maintainers haven't been around for a few years now, safe to say it's probably not coming back up. As a Hail Mary I'll tag @oliversalzburg, since they're the only active developer left in the owning org.
If that doesn't work, it may just be time to create a new project to do this instead. You could work off a fork of this or try to extend/augment a project like TraceKit to support source mapping (they'd probably appreciate the help). For posterity, I think this is the most up-to-date spec on source maps and how to retrieve them. There are some projects that could help with consuming them without writing a custom extractor.
Thanks for the ping. I will check if and how I can help later. I definitely don't have any infrastructure or domain access, and never did.
@Kenneth-Sills I reached out to @eriwen, and he replied that he will look into it and respond here. :)
All fixed now, sorry for the delay folks.
Please ping me if you see any further issues.