[Circlebit]

They are still common and popular in many places and I have found cool stuff there often.

[zvr]

I also regularly visit the 3-4 that are within 10 minutes walking distance from my place. It's fun to see that they have slowly become more "specialized"; for example, English books typically appear in only one of them.

[bombcar]

In the US they're often called "Little Free Libraries" and you can join groups around them: https://littlefreelibrary.org