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craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
YesBackpage - YesBackpage is the best backpage alternative and site similar to backpage classified. YesBackpage has replaced backpage.com as an alternative to backpage.
OsClass - Open-source PHP classifieds script to create classifieds website within 3 minutes.
Bedpage - Bedpage is a classified ad posting a website that comes as the alternative to Backpage and offers almost all the major services to post for multiple categories.
Flynax - Flynax is the leading classified script developer.