Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
JetRadar - Compare flights from hundreds of airlines & travel agencies
Momentum - Agile goal and performance management
Kiwi.com - Find and book the best low-cost flights all around the world
Habitica - Habitica is a free habit building and productivity application.