The best free alternative to Google Play Store is F-Droid, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Google Play Store and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Google Play Store are Aptoide (Free, Open Source), Steam (Free), Aurora Store (Free, Open Source) and APKPure (Free).
The #1 Bulk Downloader Tool for all your Android Devices allows you to download multiple files onto your device, all at once, without typing any annoying URLs. Create Filelinked codes with any files you want and start your downloads right away!
This enables F-Droid to install and delete apps without needing "Unknown Sources" to be enabled (e.g. just like Google Play does). It also enables F-Droid to install updates in the background without the user having to click "install".