I’m enamored of Aaron Parecki‘s Monocle reader. I can subscribe to almost anything I want, read it without interfering algorithms, and reply to posts directly in the reader, which uses Micropub to post those directly on my site, which has Webmentions to send notifications to those sites in turn.
I’m similarly in love with an app version called Indigenous for Android.
But really, who can have just one favorite?!? I also love:
They’ve not only got interesting sites, but they’re always doing cool things that are worth following.
And if you want some other interesting ones to take a peek at, I have longer list (with RSS/OPML) at https://boffosocko.com/about/following/