Trove Market - The easiest way to buy/sell used + vintage furniture
Local - Find Amazon products locally.
Wallapop - Wallapop is a free mobile app that acts as a virtual flea market for buying and selling items locally.
OurHarvest - Where farmers market meets online grocery
Kidizen - Kidizen is the top marketplace to buy and sell kids' fashion. Shop thousands of your favorite brands at up to 70% off retail. Sell your kids' and women's.
Locale - Locale helps content owners and translators work together, so Rails developers are free to write more code