While it's true that most countries have their homegrown version by now, I've used Craigslist myself in other countries, and it does have enough of a presence that it's actually maintained in over 50 countries which is no small feat.
In Denmark the place to go is dba.dk or facebook marketplace.
Checking the portugese version - its 3 items in Lisbon.
Needless to say, there's a far more popular local alternative that basically every person in Croatia knows about (njuskalo.hr).