DKAN platform ( free open sourced )
Socrata open data and ESRI Arcgis Online are paid propietary software
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Full list of current DKAN user click here : https://getdkan.org/community/
Who Changed from Socrata ( proprietary ) to DKAN ( open source )
Medicaid https://data.medicaid.gov On August 25th, 2021. Get details on API changes
Medicare https://data.medicare.gov
HealthCare https://data.healthcare.gov
Contact CMS developer, https://developer.cms.gov click contact button at top right corner
DKAN is a community-driven, free and open source open data platform that gives organizations and individuals ultimate freedom to publish and consume structured information
CKAN is an open-source DMS (data management system) for powering data hubs and data portals. CKAN makes it easy to publish, share and use data. It powers catalog.data.gov, open.canada.ca/data, data.humdata.org among many other sites.
Federal Policy and Tools https://project-open-data.cio.gov
Federal resources https://resources.data.gov