Paribus - Find out for free if online stores owe you a refund!
FareUpThere - Earn rewards for your feedback on flights
Lolli - Earn bitcoin when you shop online
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Slice Watch - Get an email when an item you've added drops in price 💸
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.