Datasite: Datasite is clean with an intuitive interface that is designed for easy navigation and use. It offers mass file uploads, drag-and-drop functionality, and data indexing that are incredibly fast.
Intralinks: Intralinks also has a user-friendly interface although some users have termed it a bit old-fashioned when compared to some other companies. It has, however, got very good features such as the ability to organize files, customized dashboards, and notification services.