IconStore - Free icon packs by first-class designers
Wallapop - Wallapop is a free mobile app that acts as a virtual flea market for buying and selling items locally.
Evericons - Evericons is a simple and totally free icon pack.
Trove Market - The easiest way to buy/sell used + vintage furniture
Feather Icons - Simply beautiful open source icons
Twice - Online Secondhand Clothing Store