Brutaldon is a brutalist, Web 1.0 web interface for Mastodon and Pleroma.
It is not a Mastodon-compatible social networking server; rather, it is just a client, like the Android or iOS client for Mastodon you may already be using, but it runs in a web server, and is accessed through a web browser.
It works great in text-mode browsers such as Lynx, w3m, or elinks, and also in more heavy-weight graphical browsers, such as Firefox.
It works completely without JavaScript, but if JavaScript is available and enabled, it will be used to unobtrusively enhance the user experience.
There is a hosted instance at brutaldon.org which you can use to log in to any instance. However, you are also encouraged to run your own, either locally or on a public server.
Brutaldon is ready for day to day use. It is still missing some features you might want, like lists, filters, and editing your own profile.