Kindle mobile app has an action which can be triggered from websites on mobile to save the page. In cases where reader view is not available on a long desktop-first post, it’s really handy. The page shows up in your library in very readable format moments later. I would love to have this functionality with a foss app/service. Any ideas?
I also found this article from 2009: https://www.cnet.com/news/what-will-you-do-with-amazons-kindle-source-code/
Apparently, not much has been going on since then