SemApps ontologies

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Like definitely typed, but for ontologies

Access most commonly used RDF ontologies/schemas/vocabularies as datasets or n-quads

JS tool to parse DTDL defined Ontologies

The Maker-Experimental package provides experimental functions relating to programmatically defining ontologies (see the @osdk/maker package). These functions are unstable and may have unexpected behavior.

ActivityPods ontologies

Generate customizable GitHub Pages companion sites for semantic ontologies.

Access most commonly used RDF ontologies/schemas/vocabularies as datasets or n-quads

MCP server that extracts domain ontologies from Python codebases

Provider-neutral authoritative SQLite backend for Party Stack ontologies. Each SQLite database is owned by exactly one ontology; use a separate database for another ontology.

ontologies-asx

The Maker package provides a type-safe, programmatic way to define ontologies, which are the foundation for structured data in Palantir Foundry. This document provides examples of how to use the maker API to define various ontology entities.

RDF triple store with named ontologies — answer relationship questions without writing join logic.

Simple client-side library for working with RDF ontologies. Includes basic CRUD abilities and functions to help you navigate an ontology hierarchy.

Compare ontologies and migrate between them.

Knowledge graphs and ontologies for AIGUI — entities, typed relations, classes with domain/range checks, drawn as 2D SVG or a three.js model.

CLI for building and operating Decidex ontologies, agents, skills, sessions, and evaluations.

Generate MCP servers from natural language descriptions, OpenAPI specs, database schemas, GraphQL, or ontologies. Supports 10+ LLM providers via Vercel AI SDK.

This vocabulary defines terms used in SHACL, the W3C Shapes Constraint Language.