Worldox - Worldox is a document and email management solution, that helps to manage share & access all digital content.
Dropbox - Online Sync and File Sharing
iManage - iManage started its services as document and file management and later on started to store contents as well and to let the businesses to store their files and data for a specified period.
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Google Drive - Access and sync your files anywhere