Google Drive - Access and sync your files anywhere

ShareFile - Secure file sharing and sync

Dropbox - Online Sync and File Sharing

Microsoft OneDrive for Business - First of all, we think it appropriate to make it clear for the readers, Microsoft OneDrive for Business is different from what is Microsoft OneDrive that is only a cloud storage and limited sharing service.

Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.

Microsoft OneDrive - Secure access, sharing & file storage