UBIdesk

Ubidesk
www.ubidesk.com
https://www.ubidesk.com/tour.php ( I did not find any video demo : ( 

Ubidesk is a web-based software that provides an online workspace for project collaboration. Provided asSoftware as a service, Ubidesk is platform independent and accessible via a web-browser without installing any application on the client side. Ubidesk offers file sharing, document collaboration, task management, and group scheduling. Multiple projects can be created with a separate access control for each project, which enables multi-level security clearance within a workspace.

• Online document editing, with the ability to see who wrote what, revision history and comparisons, and to lock documents.
• Task management, with group calendars and Gantt chart, along with the ability to assign and track tasks, and to link documents/files to a specific task. Calendars can be imported/exported via ICalendar.
• User management, allowing administrators to set up project leaders and members for each project.
• Slide-out Sidebar, which allows users to view other pages or create notes while editing a document
• Email notifications, with the ability to allow users to select on what occasion an email is to be sent.
• Help that is easily accessible, well-written and useful.^[1]