Cognitive Group’s user experience (UX) team regularly publishes a list of the ten most useful applications. Useful things save time, save energy, increases safety and provide better quality results. Google Search. Google is the ultimate gateway to the Internet. Google search engine provides all the world’s information at the tip of your finger. Coursea and iTunes University. Anyone, anywhere, can now attend classes with the best instructors in the world for free. The possibilities are endless.