Trove Market - The easiest way to buy/sell used + vintage furniture
TAP London - Tackling the homeless problem together
Wallapop - Wallapop is a free mobile app that acts as a virtual flea market for buying and selling items locally.
WeShelter - Unlock a donation when you pass a homeless person in NYC
Twice - Online Secondhand Clothing Store
Catchafire - Use your professional skills to help charities