Here is a CLI for reading Mastodon instances, no account required.

https://github.com/jwilk/zygolophodon

I've been working on a WebExtension that calls out to zygolophodon and returns plain HTML to the browser. In the process of rebasing it over recent changes but here is the working webext-old branch:

https://github.com/jwilk/zygolophodon/compare/master...pabs3...