Foursquare City Guide - Foursquare City Guide is a Free to use mobile application that will lead you to the perfect spot anytime anywhere around the world.
Recombee - Recommender system as a service that uses advanced Machine Learning and Artificial Intelligence algorithms. Easy to try and evaluate.
Flamyngo - Create a city guide with help of your friends.
Reddit List - Tracking the top 5000 subreddits
Sygic Travel Maps - Itinerary planner for independent travelers
reddit shell - Web-based shell for browsing reddit (pretend you're working)