r2rml
Powerful RDF knowledge graph generation with RML mappings
Ontology-based MCP server that analyzes database schemas (PostgreSQL, Snowflake, ClickHouse, Dremio) and generates RDF/OWL ontologies with SQL mappings for fan-trap-free Text-to-SQL.
Translator of spreadsheet mappings into R2RML, RML or YARRRML
Python + Polars engine (API or CLI based) RDF materialization engine