We will be shortly reviewing the following

Duo Lingo - free app for learning in multiple langauges
Doki language learning app
Mystery Math Museum - maths learning app
Music4Kids app - for learning the basics of music

And also the Petra Lingua online language learning courses

As a reminder, here at Ahead of the World we aim to find a small number of really worthwhile learning apps rather than deluging you with 50 suggestions a day.