Geoplatform.gov, a U.S. Department of Interior (DOI) portal for disseminating geospatial data, uses the ArcGIS Online platform to host and share U.S. government-created geospatial content. You do not have to be an ArcGIS user to utilize the portal. Data created with another software solution can be uploaded to the platform as well. The DOI has a pool of shared credits to allow access to Geoplatform.gov and the underlying data available through ArcGIS Online. Any Federal Geographic Data Committee (FGDC) agency can access the portal’s shared data library and publish to the portal. The lead for the agency must determine, however, how to allocate the credits. The credits can be used to incentivize the agency's users to use the platform. But you are not required to be an ArcGIS Online user or subscriber. The DOI wants users to build compelling applications but also to share derivative data sets. Within the next year, the DOI is looking to offer map templates and also a developer community where shared code can be offered.
See also our podcast on Geoplatform.gov.