ArcGIS Explorer is a freely available lightweight GIS data viewer from ESRI that lets you perform a variety of basic GIS functions. With ArcGIS Explorer, you can display, query, and retrieve data. Explorer may require access to an Enterprise version of ArcGIS Online.
ArcGIS Online lets you create maps within your browser and share them through embedding, email and more. If you are a current student, staff or faculty at Dartmouth, you have access to ArcGIS Online.