Esri’s newly released ArcGIS Viewer for Flex is a free, ready-to-deploy application for ArcGIS Server and ArcGIS Online services. Built with ArcGIS API for Flex version 2.1, it is designed for developers that want to customize the appearance, functionality, and content of their mapping applications without the need for programming. ArcIS Viewer for Flex includes a variety of widgets that provide much of the essential geographic information system (GIS) client functionality needed to quickly create Web mapping applications. Most of these widgets have an XML configuration file that enables them to be easily customized. ArcGIS Viewer for Flex is ideal for developers who want more control over the look and feel of their client mapping applications. To download ArcGIS Viewer for Flex, visit esri.com/flexviewer.