RDFLib is a Python library for working with RDF, a simple yet powerful language for representing information.

A distributed knowledge graph store

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

Apache Jena

SPARQL graph database

Blazegraph High Performance Graph Database

Virtuoso is a high-performance and scalable Multi-Model RDBMS, Data Integration Middleware, Linked Data Deployment, and HTTP Application Server Platform

Library extending Jupyter notebooks to integrate with Apache TinkerPop, openCypher, and RDF SPARQL.

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

EasyRdf is a PHP library designed to make it easy to consume and produce RDF.

INCEpTION provides a semantic annotation platform offering intelligent annotation assistance and knowledge management.

Information Integration Tool

Graph Data Science: an abstraction layer in Python for building knowledge graphs, integrated with popular graph libraries – atop Pandas, NetworkX, RAPIDS, RDFlib, pySHACL, PyVis, morph-kgc, pslpython, pyarrow, etc.

A wrapper for a remote SPARQL endpoint

🔗 Semantic MediaWiki turns MediaWiki into a knowledge management platform with query and export capabilities

(subjective) overview of projects which are related both to python and semantic technologies (RDF, OWL, Reasoning, ...)

The low-code Knowledge Graph application platform. Apache license.

This is the core development repository for BrightstarDB.

📬 A knowledge graph querying framework for JavaScript

Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search. It's faster than engines like Blazegraph or Virtuoso, especially for queries involving large result sets.