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open-ontologies

Active·★ 126·MIT·Updated 2026-05-29
★ Trending★ Memory & Context★ Observability

AI-native ontology engine: a Rust MCP server with tools for building, validating, querying, and reasoning over RDF/OWL ontologies. In-memory Oxigraph triple store, native OWL2-DL tableaux reasoner, SHACL validation, SPARQL, versioning. Single binary, no JVM.

Open Ontologies is a Rust MCP server and desktop Studio for AI-native ontology engineering. It provides 48 tools to build, validate, query, diff, lint, version, reason, align, and persist RDF/OWL ontologies using an in-memory Oxigraph triple store. It features Terraform-style lifecycle management, a marketplace of 30 standard ontologies, clinical crosswalks, semantic embeddings, and a full lineage audit trail.

#ai-native#claude#description-logics#knowledge-graph#linked-data#mcp#mcp-server#mcp-servers
$ Install
$ git clone https://github.com/fabio-rovai/open-ontologies.git && cd open-ontologies && cargo build --release
↗ Visit site★ GitHub
01

Features

0148 tools for ontology engineering (validate, load, query, diff, lint, reason, align, etc.)
02In-memory Oxigraph triple store with SPARQL 1.1 support
03Terraform-style lifecycle management (plan, apply, drift, enforce, monitor)
04Desktop Studio with 3D force-directed graph, AI chat, and property inspector
05Marketplace of 30 standard ontologies with clinical crosswalks and embeddings
02

Compatibility

macOS
macOS (Intel & Apple Silicon)
Verified via docs
Linux
Linux (x86_64)
Verified via docs
Docker
Docker (any platform)
Verified via docs
03

Quick start

1
$ git clone https://github.com/fabio-rovai/open-ontologies.git
2
$ cd open-ontologies
3
$ cargo build --release
04

Use cases

↳Build and validate domain ontologies from natural language instructions using Claude
↳Manage ontology versions and drift detection in CI/CD pipelines
↳Align and crosswalk clinical codes (ICD-10, SNOMED, MeSH) to research ontologies
05

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Related searches

open-ontologies AlternativesBest Memory & Context Tools 2026Open Source Memory & Contextopen-ontologies Tutorialopen-ontologies Vs Competitorsai-nativeclaudedescription-logics

Comments

Log in to leave a comment
  • E
    Emerson JohnsonMay 3, 2026

    Validation tools catch ontology inconsistencies that manual review misses.

  • Elliot Rivera
    Elliot RiveraApr 10, 2026

    Good for knowledge engineers and semantic web developers who want AI assistance.

  • L
    Logan MartinezApr 3, 2026

    Rust implementation means ontology operations are fast even for large ontologies.

  • R
    Rebel KimMar 5, 2026

    AI-native ontology engine in Rust with tools for building and validating ontologies.

On this page
01Features02Compatibility03Quick start04Use cases05Alternatives
Stats
GitHub Stars★ 126
Last commit1d ago
StatusActive
LicenseMIT
CategoryMemory & Context
Trend (30d)
+5↑ 0.8%
Links
Documentation↗Discussion↗Issues↗Releases↗

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