Designing a classified website is difficult thing to do. Usually these websites have very big number of website pages and each is manage or treated is similar way. Making a classified website is huge project and it needs proper design with understanding of database. Every classified ads websites cover all aspect of life and usually these are free.
You can easily sell or buy anything from classified websites. In every country different classified ads websites are popular, like in India olx is very popular and especially classified ads in Mumbai are visited regularly by many peoples. For inspiration and get idea of classified website design I manage to collect some of the top classified ads websites. It all about creativity how web designer manage and design these huge websites.
Port Land Mercury
Penny Saver USA
Town Market Place
I Net Giant