Audiojack is described as 'Take back your imagination with Audiojack! Listen as stories unfold and take you to far off places, back in time, or even your own back yard' and is an app in the Education & Reference category. There are five alternatives to Audiojack for iPhone, iPad and Android. The best alternative is Keeble. It's not free, so if you're looking for a free alternative, you could try Microsoft Soundscape or Eclipse Soundscapes. Other great apps like Audiojack are Proloquo4Text (Paid) and Proloquo2Go (Paid).
The Eclipse Soundscapes Project app is specially designed so that people who are blind and visually impaired can share in the awe and wonder of astronomical events in real time with their sighted peers.