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Ontop is a platform to query relational databases as Virtual RDF Knowledge Graphs using SPARQL

op-geth is an Ethereum execution client optimized for the Optimism Layer 2 scaling solution

Open Policy Agent (OPA) is an open source, general-purpose policy engine..

Open Policy Agent (OPA) is an open source, general-purpose policy engine..

OPAL is an administration layer for Policy Engines

OPAL is an administration layer for Policy Engines