Fat Lama - Borrow stuff you need. Lend stuff you don't

RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.

Ruckify - peer-to-peer marketplace for rentals

Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything

Daylui.com - Daylui is an "Airbnb for everyhing else".

Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.