Apkbob is a simple APK sharing platform, for APK files. You can add APK files easily by dragging and dropping them anywhere or clicking.
Demo: https://codecanyon.net/item/apkbob-simple-apk-sharing-platform/41881194
Apk Download Google Play Store is a platform to build a website to download apk with just a few clicks.
Demo: https://www.codester.com/items/30601/apk-download-google-play-store-laravel-admin
Website 2 APK Builder Pro is a great program to convert your website into an Android application.
Demo: https://websitetoapk.com