Unity - The multiplatform game creation tools for everyone.
Mashs and the Bear - Mashs and the Bear developed and published by 01Digital for Android and iOS devices.
Godot Engine - Feature-packed 2D and 3D open source game engine.
YouTube Kids - YouTube for the youngins on iOS and Android
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ChuChu TV LITE - ChuChu TV LITE Best Nursery Rhymes Videos For Kids is an interesting app to stream more than 1000 videos.