Zulip is working on having public view of streams without having an account. It's already being experimently deployed on the Zulip Dev's server.So that should make its way to other consumer servers soon!
I had created this extension for my personal use, that "modernizes" the Zulip UI. Most people seem to have a better UI experience using it from the feedback I have received. Feel free to try it out .
https://addons.mozilla.org/en-US/firefox/addon/prettier-zuli...