Geocortex Essentials is an unrivalled way to enable your investment in ArcGIS Server and ArcGIS Online web mapping technology. With Geocortex Essentials you gain a significant head-start by taking advantage of pre-built functionality that almost every organization can use. A paper napkin no longer needs to be the starting point to launch your next great GIS project. Software that is flexible enough to meet a variety of needs means that both GIS administrators and developers must have the inner workings of applications accessible to them. Geocortex Essentials elegantly accommodates this through an integrated framework of components. A hodge-podge of tools and utilities that don't cohesively work together is a step backwards. In some situations, there are specific aspects of your application that you may want to tailor that go beyond the scope of our configuration tools. You can extend Geocortex further by using our comprehensive client-side object model and development framework, command and event registration capabilities, and server-side REST API. Programmers are significantly more productive by taking advantage of the Geocortex SDK.