[sien]

In Australia it's 'Street Library'

https://streetlibrary.org.au/

Do they have other names in different countries?

[amatecha]

in NA we have to call them "free libraries" because the concept of not having to pay for something is so rare, it has to be clearly indicated upfront! (joking lol, mostly!!)

[singpolyma3]

I think being free is implied in being a library