Amaze File Manager is a free and open source file manager for Android with zero ads or in-app purchases.
Ranked in these QuestionsQuestion Ranking
Pro Open source
Amaze File Manager is an opensource file manager.
Pro Material Design and fast operation
Amaze File Manager follows the Material Design guidelines as well as operates very fast.
Pro Light on resource consumption
This app has a very specific purpose - browsing and interacting with your files. It remains light (no incurred battery usage) and doesn't pollute your phone with new apps to open your files but instead uses your default applications for that.
Pro Built-in SMB client
Amaze File Manager can connect to SMB shares (AKA samba, AKA window shared folders).
Press the "+" button, then "Cloud connection", then "SMB Connection".
Pro Light and dark themes
Pro Built-in root explorer
If your Android device is rooted, you can use this app to access system files.
Pro Built-in FTP server
That's an easy way to access your phone filesystem from another device. But be careful when using it on untrusted networks, because FTP protocol has encryption.
Pro Great customer support
Support is available 24/7. Your emails will be answered within 24 hours.
Con No networking tools
Sadly there are no networking tools built into Amaze File Manager.