Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Gainful.io - Capture B2B leads on AngelList, CrunchBase and LinkedIn
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything