Dropbox - Online Sync and File Sharing
Zapya - Zaypa is a cross-platform transferring and sharing!
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
SHAREit - SHAREit allows you to transfer files and data from your phone to another device without having to rely on WiFi or a data plan.
CM Transfer - CM Transfer – Share Any Files with Friends Nearby is a free to use mobile application that comes with the beautifully redesigned new look and enhanced file transferring technology that makes the sharing of files faster, simple, and secure.
Koofr - Koofr offers safe EU based cloud storage with free storage space for life and options to connect multiple cloud accounts (Dropbox, Google Drive, OneDrive) and your personal storages.