Foursquare - Foursquare is all about helping you find new ways to explore your city.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Yellow Pages - YP.com local search connects you with over 19 million local businesses.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.