Experify - Connecting you to owners of products for honest opinions.
Pattern by Etsy - Turn your Etsy shop into your own website
Whatnot - The safest place to buy & sell collectibles
Moast - Moast uses your community of loyal customers to accelerate your sales cycle.
Fobo - Forget Craigslist, use this to buy/sell electronics (SF)
Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.