ArcGIS for AutoCAD 300 versions

It is a CAD program designed for electrical controls designers.

ArcGIS Engine is a complete library of embeddable GIS components for developers.

Free

ArcGIS extension with geospatial analysis capabilities for mlitary applications.

Free

It expands the geodatabase functionality of the ArcGIS Explorer Desktop app.

Free

You can view an image service using various client applications.