Cartoview is an open source web framework for managing and deploying  geospatial and business Applications, the architecture of Cartoview makes it easy to efficiently develop and maintain and deploy GIS enterprise applications. The Cartoview App market offers a variety of apps that are simply deployed directly from the browser, the apps allow you to easily handle your spatial data under ESRI and OGC standards, create maps, interact with users and manage your business. Use Cartoview to manage and publish your geospatial data, host your mapping applications, integrate with the ArcGIS platform and much more.

Cartoview covers and serves local government , state government , emergency management , crisis mapping , business management , road safety , citizen engagement and much more solutions. The metadata management through cartoview supports INSPIRE , CSW and OGC standards. 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. 

For further details you can find more at Cartoview website  and NYC demo.