Users can sell brand-new or gently used items, such as furniture, collectibles, electronics, clothes, and electronics, on these apps. Whether you want to start a side business as a rerummyearnseller or clean out your closet, selling and reselling apps provide an easy way to list things for sale, interact with buyers, and get money from your unwanted stuff. With a few clicks on your smartphone, you can use these apps to convert your clutter into cash. Poshmark is a well-known selling app that lets users buy & sell clothing straight out of their closets.