Openbazaar - A free online marketplace to buy and sell goods / services using Bitcoin. OpenBazaar is a peer-to-peer ecommerce platform with no fees or restrictions.

craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events

Etsy - Buy and sell handmade or vintage items, art and supplies on Etsy, the worlds most vibrant handmade...

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.

eBay - Buy and sell electronics, cars, fashion apparel, collectibles, sporting goods, digital cameras, baby items, coupons, and everything else on eBay, the world's online marketplace

Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.