/Tab - The simple way to split a bill among friends.
Grover - Rent electronics for a month & try it before you buy.
Diggsweep - Easily create your own 'garage sale' to share with others
Shelf Engine - Vendors get paid for only products they sell
PayPal.Me - Request money using your own personalized URL.
Origin Marketplace - Power hundreds of decentralized, peer-to-peer marketplaces