KidHab - Develop useful habits in your kid together
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
Kids in Touch - A safe, fun, messaging app for kids monitored by parents
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free
Fitbit Ace - Fitness fun for kids
APKMirror - Android Market and APK Downloads