Vue.js - Reactive Components for Modern Web Interfaces
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.
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
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
Webix UI - An enterprise JavaScript Library for cross-platform app development with HTML5 JavaScript widgets and easy integration with most popular JavaScript Frameworks.
APKMirror - Android Market and APK Downloads