FareUpThere - Earn rewards for your feedback on flights
Google Flights - Find cheap flights in seconds, explore destinations on a map, and sign up for fare alerts on Google Flights.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Eighty App - Convenient travel wishlist app with booking alerts
Eddy Travels for Slack - Flight search for teams in Slack
Roomino - Simple travel booking for Slack teams