GasBuddy - GasBuddy lets you search for Gas Prices by city, state, zip code, with listings for all cities in the USA and Canada. Updated in real-time, with national average price for gasoline, current trends, and mapping tools.

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

Fuelly - Fuelly allows you to tracks your gas mileage over time, helping you calculate fuel expenses as you drive.

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

Fuelio - Track your fill-ups, fuel consumption, fuel costs and save money.

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