Best Android apps available right now!
With the sheer number of available apps for your Android device, the choices can be overwhelming. Here is a list of Android apps that stand alone at the top of the pantheon.
1. Mix File Manager
A mix of explorers (SD, FTP, LAN, Cloud and other storage explorers) is a fast, smooth, beautiful, reliable and fully-featured file manager with a simple and intuitive user interface. This app has no ads, is and will always remain completely free.
Features:
* Unlimited Tabbed browsing and Dual panel in landscape mode and Drag and Drop between panels.
* Easily create Automatic Tasks to Copy, Move, … operations.
* Customizable bookmarks drawer with essential file types already categorized.
* Advanced search functions.
* Encrypt/Decrypt files.
* eBook reader which supports PDF, Epub and…
* Extract and create 7z, ZIP, RAR, TAR, TAR.GZ, TAR.BZ2, GZIP, BZIP2, XZ, WIM, Lizard, LZ4, LZ5, Zstandard.
* All your cloud storage needs accessible from one single app. Choose from 19 providers like Amazon Cloud drive, Dropbox, Box, Google Drive, Meo, OneDrive, pCloud, SugarSync, VDisk and others
Link: XDA Lab (free) / Direct Link / Play Store (Paid)
2. YouTube Vanced
YouTube Vanced is the stock Android YouTube app, but better! Includes adblocking, background playback, PIP, true amoled dark mode and a lot more. It’s Open source and free
Link: Website
3. Videoder
Made with️ in India, it is the only app you’ll need to download videos from any website. Yes! YouTube, Hotstar included with 4k support.
Link: Website
5. Keepass2Android (Password manager)
An open source password manager application for Android. It is compatible with the popular KeePass 2.x Password Safe for Windows. It has amazing features like cloud sync, fingerprint unlock, AutoFill service & an integrated soft-keyboard to safely and easily pass the passwords to websites and apps.
Link: Play Store
6. Disk usage
Open Source and free, DiskUsage provides a way to find files and directories on storage which consume a lot of space. Displays diagram with directories/subdirectories proportional to their size.
Link: Play Store
8. SMS Organizer
SMS Organizer, a Microsoft Garage project, is the smartest of all SMS apps. It automatically organizes your inbox, sets reminders and keeps track of your expenses—all this magic happens on your device safely.
Link: Play Store
9. Automate
Automate various tasks on your Android smartphone or tablet. Create your automation using flowcharts. Automatically change settings like audio volume, Bluetooth, GPS, Wi-Fi, NFC, and perform actions like sending SMS or e-mail, copy files to FTP or Google Drive, play music or take photos, based on your location, time of day, foreground app, battery level or any other event trigger.
Link: Play Store
10. All-In-One Calculator
Featuring over 75 FREE Calculators and Unit Converters packed in with a Simple or Scientific Calculator, it’s the only calculator you will need from now on on your device.
Link: Play Store

Very nicely put, very much useful information.
Thank you