  We describe the first major public data release from cosmological simulations
carried out with Argonne's HACC code. This initial release covers a range of
datasets from large gravity-only simulations. The data products include halo
information for multiple redshifts, down-sampled particles, and lightcone
outputs. We provide data from two very large LCDM simulations as well as
beyond-LCDM simulations spanning eleven w0-wa cosmologies. Our release platform
uses Petrel, a research data service, located at the Argonne Leadership
Computing Facility. Petrel offers fast data transfer mechanisms and
authentication via Globus, enabling simple and efficient access to stored
datasets. Easy browsing of the available data products is provided via a web
portal that allows the user to navigate simulation products efficiently. The
data hub will be extended by adding more types of data products and by enabling
computational capabilities to allow direct interactions with simulation
results.
