Ontology GitHub Repositories (2026) · Open Source Tools

Connect your company's data, let an agent draft an ontology over it, and load it into HelixDB as one graph you can explore and ask questions of. Hosted at foundry.helix-db.com, or run it on your own machine.

World's first open-source enterprise world model.

The Governance Platform for Agents, Knowledge, and Context

Graph-Native Infrastructure for Context and Accountable AI Systems

Open-source TypeScript framework for building operational software used by humans and AI agents.

open-source ontology platform for operational digital twins

A unifying framework for biomedical research knowledge graphs

ROBOT is an OBO Tool

Understand what your codebase builds, why it is structured that way, and what a change could affect. One shared Markdown ontology for humans and coding agents—visualized for people, accessible to agents through MCP, and reviewed with Git. Local-first. Open source.

Support agile Ontology DataOps Based on Flink, DataX and Flink-CDC with Web-UI

Plan, apply and roll back changes to a production ontology, with a blast radius report and a proof an auditor can re-check.

NVIDIA Auto Ontology's semantic layer and a personal knowledge base as an MCP server for Claude, ChatGPT and other MCP clients. No LLM API key needed.

An ontology of cell types

Documentation pages for web ontologies.

Ontology-Augmented Generation for AI agents.

Evidence validation and policy engine for AI-assisted biological curation

An OBO file parser.