ESRI announces that its popular Web mapping APIs (Javascript, Flex and Silverlight) are available at no cost to users who are building non-commercial applications. Until now only available to licensed users, UN agencies, NGOs, and educational institutions now can take advantage of fast, high-quality mapping applications built on top of ArcGIS Server for no additional cost.
For further information, please visit:
http://www.esri.com/getting_started/developers/web_mapping_apis.html
