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.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
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
ioBroker - flexible and modular application for the IoT and Smarthome
APKMirror - Android Market and APK Downloads
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation