Individuals can sell old appliances that are still usable in local used appliance shops, which normally pick them up from the seller's home, or on e-commerce platforms such as eBay or Craigslist. Another option is the classic print-out notice that one can hang around in the neighborhood.
The problem with old appliances is normally their size. As they tend to be bulky and heavy, people usually would like to have them picked up from home, if possibly for free. If the appliances are still functioning, the best option is to put them for sale on an e-commerce platform specifying their position and availability only by self pick-up.