The Google Play store and Apple Apps store each offer millions of apps. Problem is unless you know what your specifically looking for its kinda hard to find apps of interest. Here are indexes for these stores that allows users to browse for apps using the index, enabling you to find apps that match with your personal interests.
entertainment movies TV apps
virtual and augmented reality apps
pets apps
play by age apps
science and social science apps
health and wellness apps
potpourri apps including antiques animals Beauty chat collecting comic books gardening literary making things Mystic Performing Arts photography