LeBonCoin is actually a fork of the Swedish original site Blocket.se, visit it and you will see similarities. Both are today owned by the Norwegian umbrella organisation Schibsted afaik.
Yes, http://segundamano.es/ was the spanish version but it looks like the merged it with another site. https://www.finn.no/ is the norwegian version but it was developed seperately. https://www.tori.fi/ is the finnish one. Such listing sites are big business and they make a lot of money of them.
They have done similar stuff with Prisjakt.nu and made a french version: https://ledenicheur.fr/
I think there are even more still but I am not certain.