Brutaldon is a brutal, Web 1.0 web interface for Mastodon. You can use it as a client for any instance. You do not need a separate brutaldon account. It is compatible with almost any web browser, including text-mode browsers like lynx, w3m, or eww. Screenshots, issues tracker, and source code are available here.
This adds to several other alternative Mastodon frontends, like Pinafore and Halcyon. The latter can be used with Pleroma, as well as a new diaspora-like frontend Feather.