StockX - Stock market for buying/selling limited edition sneakers
Artsy - A global platform for discovering and collecting art.
thredUp - thredUp is the free fashion resale app for the consumer to buy and sell secondhand clothing online.
Chairish - Shop Chairish, the design insider's source for the very best in vintage and contemporary furniture, decor and art.
Poshmark - Poshmark is the #1 place to buy and sell fashion. Shop millions of closets–and sell yours too!
1stdibs - Antique and Modern Furniture, Jewelry, Fashion & Art