WebOffice 10.9 R4 is the High-End Internet/Web GIS solution from VertiGIS GmbH based on Esri ArcGIS Server technology.  WebOffice 10.9 R4 uses JAVA technology on the server side and HTML5 / JavaScript technology on the client side. Because of the use of JAVA WebOffice 10.9 R4 is a cross platform product.