Cartoview is a suite of enterprise geospatial applications built on a common architecture using GIS web data services from ESRI and from OGC.
The apps and architecture of CartoView make it easy to efficiently develop and maintain enterprise applications.
Very simple, just download your geosapatial apps, install and configure on your server and you are ready to go.
You want to build your own custom app no problem, the loosely coupled nature of the applications makes these components easy to understand, extend and customize.
CartoView is licensed under the Apache License Version 2.0 which grants you the right to customize, extend, modify, repackage, resell, and many other potential uses of the system.