Habitica - Habitica is a free habit building and productivity application.

UXTesting - Discover how your mobile users feel

Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.

Startup Timelines - How the frontpages of famous startups changed over time

Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...

Laws of UX - Key maxims that designers must consider when building UX