Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Balsamiq Cloud - Fast, approachable, collaborative wireframing
Vouchertoday - Save money every day with the latest voucher codes, discount codes, and deals when you shop at your favorite stores. Updated daily and always working. 👍
Justinmind - Define awesome experiences through wireframes & prototypes.
Briefcase by AppSumo - "Netflix for software"