A curated list of various semantic web and linked data resources.

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

Information Integration Tool

Powerful RDF Knowledge Graph Generation with RML Mappings

A pretty sweet RML engine, for RDF.

RDF by Example: rdfpuml for True RDF Diagrams, rdf2rml for R2RML Generation

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.

an RDF datastore that gives researchers control over the sharing of data between datasets

Translator of spreadsheet mappings into R2RML, RML or YARRRML

GTFS-Madrid-Bench: A Benchmark for Knowledge Graph Construction Engines

3xtudio is a web-based visual editor for RML mappings

R2RML API

PhD thesis: "Knowledge Graph Construction from Heterogeneous Data Sources exploiting Declarative Mapping Rules"

Logos for RDF formats (RDF/XML, N-Triples, RDFa, SPARQL, R2RML, SHACL) in PNG and SVG

A friendly language for mappings to RDF

Online Mapping Editor

An experiment in taking random rdf and getting an "optimized" sparql endpoint based on sql (duckdb)

ITT: A general architecture for virtual knowledge graphs

A modular R2RML suite built on Apache Jena. Featuring a complete domain API built on Jena's polymorphism system, SHACL validation, an R2RML processor with 100% standard conformance based an Jena's ARQ plus common tooling every R2RML project needs.

A JSON Schema to let editors (e.g., VS Code) syntax-check YARRRML files