Decisionize - Simplify decision making in 3 easy steps
Recombee - Recommender system as a service that uses advanced Machine Learning and Artificial Intelligence algorithms. Easy to try and evaluate.
Flotsm - Anonymously seek opinions on everyday decisions
Reddit List - Tracking the top 5000 subreddits
TopRecs - The power of recommendations from your trusted friends
reddit shell - Web-based shell for browsing reddit (pretend you're working)