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.
GrowBot Automator for Instagram - This bot can automatically follow all of someone's followers for you.
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
InstaPy - Automation script for “farming” likes, comments and followers on Instagram
APKMirror - Android Market and APK Downloads
Everliker - Smart and simple assistant for Instagram