This post is about Zotero. https://www.zotero.org/
If you are not an academic, you might not know Zotero.
It is such a pleasure to use. Every app should be like this.
I read everything in it, including books I'm going through right now from https://teachyourselfcs.com/
It also does an amazing job of taking snapshots of posts. I use it all the time to grab posts from HackerNews so I can mark them up.
And it automagically syncs everywhere across devices and lets me store way too many files on the web like the ADD packrat I am, without breaking a sweat.
In short, this software just works, and it works well. So when somebody behind Zotero talks about how to develop software, I listen.
And it's a fun post with some history. You should save this post to Zotero, and then read it.