Open Knowledge Graphs

Knowledge graphs, ontologies, tools, and jobs—find them at Open Knowledge Graphs. We’re building an open directory to help you discover what’s out there and who’s building it. Explore: openknowledgegraphs.com What should we add next?

📦 Software Update: SPARQL Anything 1.3 Turn CSV, JSON and XML into knowledge graphs using SPARQL. This release improves file handling and fixes a bug that could merge unrelated data from different sources. openknowledgegraphs.com/software/spa... #KnowledgeGraphs #SPARQL

💼 Reddit is hiring an Engineering Manager, Knowledge Graph Platform. Lead the team connecting Reddit’s content for search, ads and AI. 📍 Remote · US/Canada 💰 US base: $217K–$303.9K job-boards.greenhouse.io/reddit/jobs/... #KnowledgeGraphs #Hiring

🔎 Open-Source Spotlight: HeFQUIN Knowledge graphs in different systems? Query them together with SPARQL, without copying everything into one database. From @olafhartig.bsky.social and colleagues. openknowledgegraphs.com/software/hef... #KnowledgeGraphs #SPARQL

🏦 Ontology Update: FIBO 2026Q3 The Financial Industry Business Ontology expands digital asset coverage and adds ACTUS contract terminology—helping institutions describe financial products consistently. openknowledgegraphs.com/resource/fin...

🧠 A poster or a home visit? Both might be called “handwashing promotion.” The Behaviour Change Intervention Ontology captures these differences so researchers can compare what works. @hbcproject.bsky.social @susanmichie.bsky.social openknowledgegraphs.com/resource/beh...

🥐 Standards Spotlight: Croissant Croissant from @mlcommons.org describes machine-learning datasets, including their files and fields—helping tools load and interpret data with less custom setup. Built on schema .org and JSON-LD. openknowledgegraphs.com/resource/cro... #LinkedData #MachineLearning

📦 Software Release: Sparnatural 14.0 Explore knowledge graphs without writing SPARQL. Filters and suggested values adapt as you search, helping avoid empty results. Developed by Sparna openknowledgegraphs.com/software/spa... #KnowledgeGraphs #SPARQL

The first Open Knowledge Graphs newsletter is here! 🎉 🛠️ 8 software updates 📚 4 ontology releases 👀 Jelly + HeFQUIN: projects to watch 💼 5 jobs What changed, why it matters, and where to explore. Read it → stevehedden.substack.com/p/open-knowl... #KnowledgeGraphs

📦 Software Release: OntoBricks 0.9.0 Turn Databricks tables into knowledge graphs. This release adds ontology review checkpoints, a SPARQL playground and record-level quality checks. openknowledgegraphs.com/software/ont... #KnowledgeGraphs #Databricks @databricksinc.bsky.social

🌍 Ontology Spotlight: ENVO From forests and lakes to soil and seawater, the Environment Ontology provides shared terms for describing environments—helping researchers compare data across studies. openknowledgegraphs.com/resource/env... #Ontologies #KnowledgeGraphs

📦 Software Release: Memgraph 3.14.0 More flexible Cypher queries, plus tools to view and terminate active sessions. OPTIONAL CALL keeps results when a subquery finds no match. @katelatte.bsky.social openknowledgegraphs.com/software/mem... #KnowledgeGraphs

🔎 Open Source Spotlight: pySHACL Catch missing values and incorrect datatypes in your knowledge graph. Validate RDF against SHACL rules from Python or the command line, with reports showing what needs fixing. openknowledgegraphs.com/software/pys... #KnowledgeGraphs #Python

💼 @sap.com is hiring a Knowledge Graph Tech Lead. Shape its Industry Knowledge Graph with RDF, SHACL and SPARQL. 📍 Munich area, Germany · Hybrid careers.sap.com/job/Garching... #KnowledgeGraphs #Hiring

📦 Software Release: GestaltDB 0.12.1 GestaltDB brings a graph database into your Python app. This release fixes bulk edge imports and updates to claims’ confidence and provenance. openknowledgegraphs.com/software/ges... #KnowledgeGraphs #Python

🧬 Ontology Update: EFO 3.95.0 EFO connects terms used to describe biomedical experiments. This release adds disease and phenotype terms for Open Targets Safety 2.0. @ebi.embl.org openknowledgegraphs.com/resource/exp... #Ontologies

📦 Software Release: MatGUI 6.8.0 Query knowledge graphs with SPARQL. This release brings queries and results together and adds search across saved queries, commands and snippets. From MatData openknowledgegraphs.com/software/yas... #KnowledgeGraphs #SPARQL

🕒 Ontology Spotlight: OWL-Time OWL-Time describes dates, durations and whether events happen before, during or after one another. Co-edited by @dr-shorthair.bsky.social openknowledgegraphs.com/resource/tim... #KnowledgeGraphs #LinkedData

📚 Standards Spotlight: European Learning Model ELM provides shared terms for courses, qualifications and credentials—helping systems exchange learning records across borders. Developed by @ec.europa.eu openknowledgegraphs.com/resource/eur... #LinkedData

📚 Standards Spotlight: EPCIS EPCIS from GS1 helps supply-chain systems share what happened to a product, where and when—connecting factory, warehouse and shipping records for traceability. openknowledgegraphs.com/resource/epc... #KnowledgeGraphs #SupplyChain

📏 Ontology Spotlight: QUDT QUDT gives measurements shared definitions for quantities and units—helping teams combine sensor, engineering and scientific data without losing what the numbers mean. openknowledgegraphs.com/resource/qud...

📦 Software Release: Cognee 1.6.5 Cognee builds knowledge graphs as memory for AI agents. This release links code documentation to functions and classes for richer search and processes agent activity faster. @cognee.bsky.social openknowledgegraphs.com/software/cog... #KnowledgeGraphs

📦 Software Release: Kolibrie 0.2.0 Kolibrie runs SPARQL queries over RDF data. This release adds named graphs, data updates and rules for reasoning over time—useful for working with changing data. openknowledgegraphs.com/software/kol... #KnowledgeGraphs #SPARQL

📚 Standards Spotlight: mCODE For projects connecting cancer care data, mCODE provides shared definitions for diagnoses, treatments and outcomes—helping health systems exchange information. @ascocancer.bsky.social openknowledgegraphs.com/resource/min... #HealthIT

📚 Standards Spotlight: FHIR FHIR from HL7 provides shared data models and APIs for exchanging patient information, lab results and medications between healthcare apps. @hl7europe.bsky.social openknowledgegraphs.com/resource/fas... #HealthIT

🏭 Ontology Spotlight: IOF Core IOF Core provides shared terms for materials, equipment and processes to connect manufacturing data across factories and suppliers. From the Industrial Ontologies Foundry at OAGi. openknowledgegraphs.com/resource/iof... #KnowledgeGraphs #Manufacturing

🏢 Ontology Spotlight: Brick Brick describes building equipment, sensors and their relationships, helping applications work across different building systems. Maintained by @gtf.fyi and contributors. openknowledgegraphs.com/resource/bri... #KnowledgeGraphs #SmartBuildings

📚 Standards Spotlight: IRIS+ The IRIS+ Catalog of Metrics from GIIN helps impact investors measure and report the social and environmental results of their investments using shared definitions. openknowledgegraphs.com/resource/iri... #OpenData #ImpactInvesting

📚 Standards Spotlight: GeoSPARQL For projects combining maps and knowledge graphs, GeoSPARQL represents geographic data in RDF and supports queries about distance, overlap and containment. openknowledgegraphs.com/resource/geo... #KnowledgeGraphs #Geospatial

🔎 Open-Source Spotlight: RMLMapper For projects turning CSV, JSON or XML into a knowledge graph, RMLMapper uses mapping rules to generate RDF—connecting source fields to shared vocabularies. openknowledgegraphs.com/software/rml... #KnowledgeGraphs #LinkedData

📦 Software Release: Ontology Development Suite 0.15.0 Build and check OWL ontologies in VS Code. This release expands TypeScript scripting to cover individuals, property chains and datatype constraints. openknowledgegraphs.com/software/ont... #Ontologies

📦 Software Release: LinkML-Scala 0.17.0 Turn data models into code and validation rules. This release adds OWL/RDFS import and export, plus TypeScript and Pydantic generators. From @neverblinkeu.bsky.social openknowledgegraphs.com/software/lin... #LinkML

📚 Standards Spotlight: EML Ecological Metadata Language describes where, when and how data was collected, plus what its columns mean—helping others reuse it. Supported by @nceas-ucsb.bsky.social openknowledgegraphs.com/resource/eco... #Metadata #OpenScience

📚 Standards Spotlight: DDI Sharing survey data? DDI standards describe questions, variables and how data was collected, helping others understand and reuse it. From @ddialliance.bsky.social openknowledgegraphs.com/resource/dat... #Metadata #OpenData

🔎 Open-Source Spotlight: Comunica RDF data spread across different sources? Comunica lets you query them together with SPARQL, from JavaScript applications or the command line. openknowledgegraphs.com/software/com... #KnowledgeGraphs #SPARQL

📦 Software Release: TuringDB 3.0.1 TuringDB is a graph database queried with Cypher. This release expands support for conditional queries, lists and maps, with fixes for data imports and vector indexes. openknowledgegraphs.com/software/tur... #KnowledgeGraphs #Cypher

📦 Software Release: Fluree 4.2.3 Fluree is a knowledge graph database. This release adds SPARQL request options and more control over querying across named graphs. openknowledgegraphs.com/software/flu... #KnowledgeGraphs #SPARQL

📚 Vocabulary Update: SOSA/SSN SOSA/SSN describes sensors, observations, sampling and actuation. A new W3C working draft organizes these into modules, helping projects use the pieces they need to connect measurement data. openknowledgegraphs.com/resource/sem... #SemanticWeb #IoT

💼 Reddit is hiring a Staff ML Engineer, Ads Foundational Representations. Work on knowledge graph and content embeddings for ad relevance and business insights. 📍 Remote · UK / Netherlands job-boards.greenhouse.io/reddit/jobs/... #KnowledgeGraphs #Hiring

🧬 Vocabulary Update: Uberon Uberon gives anatomical structures shared identifiers, helping connect tissue and cell data. Its October 1 release expands coverage using the Human Reference Atlas. @cmungall.bsky.social and team openknowledgegraphs.com/resource/ube...

📦 Software Release: LinkedDataHub 6.1.0 LinkedDataHub helps teams build apps around linked data. This release fixes conflicting concurrent edits and restoring earlier document versions. From @atomgraph.bsky.social openknowledgegraphs.com/software/lin...

📦 Software Release: ArcadeDB 26.10.1 ArcadeDB is an open-source database for graph, document and vector data. This release addresses cluster recovery, lost updates and security issues. From @arcadedb.bsky.social openknowledgegraphs.com/software/arc...

🔎 Open-Source Spotlight: WIDOCO For projects publishing an ontology, WIDOCO generates HTML documentation from its terms and annotations, with diagrams and changelogs to help readers understand the model. Built by @dgarijo.bsky.social and contributors openknowledgegraphs.com/software/wid...

🔎 Open-Source Spotlight: Ontospy For projects that need to understand or document an ontology, Ontospy lets you inspect RDF models in Python or the command line and generate HTML documentation. Built by Michele Pasin and contributors openknowledgegraphs.com/software/ont...

🔎 Open-Source Spotlight: RDF Sketch RDF Sketch from Zazuko lets you edit RDF in your browser and visualize, search, and explore the graph—useful for inspecting data or explaining its structure. @ktk.netlabs.org openknowledgegraphs.com/software/rdf... #KnowledgeGraphs #LinkedData

🔎 Open-Source Spotlight: Prez For projects that need to share RDF data with applications, Prez provides a configurable Linked Data API with readable labels. Recent updates add Jena Lucene-backed search. Built by @edmondchuc.com and team openknowledgegraphs.com/software/pre...

🎬 Who made this shot, using which assets? The MovieLabs Ontology for Media Creation connects people, tasks and assets—giving film and TV production tools a shared language. openknowledgegraphs.com/resource/mov... #Ontologies #Filmmaking

🧭 Where did this data come from—and who changed it? PROV-O connects data, the activities that produced it, and the people or software responsible, helping you trace its history across systems. openknowledgegraphs.com/resource/pro... #KnowledgeGraphs #LinkedData

🔎 Missing names? Dates stored as text? Too many values where you expected one? SHACL lets you define rules for RDF data and check your graph against them—catching problems before they reach your applications. openknowledgegraphs.com/resource/sha... #KnowledgeGraphs #DataQuality #SHACL

🧩 Working with RDF in JavaScript? N3.js 2.8.0 lets you choose whether matched data stays a fixed snapshot or tracks changes in the underlying store—useful when your graph keeps changing. openknowledgegraphs.com/software/n3-... @jeswr.bsky.social #LinkedData #JavaScript

♻️ What’s in a product—and how much is recycled? Schema.org 30.1 adds terms for Digital Product Passports, covering recycled content, substances of concern and conformity declarations. #LinkedData #Sustainability @danbri.bsky.social