Here is the Top Ten List of World Classified Sites What is Your Favorite ?? 

https://craigslist.org/
https://www.avito.ru/rossiya
https://www.leboncoin.fr/
https://www.sahibinden.com/
https://olx.com.br/
https://www.olx.ua/
https://www.subito.it/
https://www.kijiji.ca/
https://www.gumtree.com/
https://g.58.com/city