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"How to Query a Knowledge Graph Using an Ontology" matching MCP servers:

  • DocGraph

    Detective-XH
    A
    license
    A
    quality
    A
    maintenance
    MCP server that indexes Markdown, Word, HTML, and PDF documents into a SQLite knowledge graph with CJK+Latin full-text search and cross-document reference tracking. Runs drift audits to surface stale policies, conflicting research claims, superseded ADRs, and undocumented code exports.
    Last updated
    10
    5
    MIT
  • knowing by blackwell-systems

    knowingofficial

    blackwell-systems
    A
    license
    -
    quality
    A
    maintenance
    Content-addressed code graph that produces ranked context for AI agents in one call. 22 MCP tools across indexing, blast radius, test scope, semantic diff, runtime traffic, and feedback-aware context packing. Incremental updates via Merkle DAG (no re-indexing). GCF wire format saves 84% tokens vs JSON
    Last updated
    16
    MIT
  • GraphJin by dosco

    GraphJinofficial

    dosco
    A
    license
    -
    quality
    B
    maintenance
    Enables AI assistants to query databases using natural language, with automatic schema discovery and SQL compilation.
    Last updated
    843
    3,130
    Apache 2.0
  • Axiom by axiomhq

    Axiomofficial

    axiomhq
    A
    license
    -
    quality
    F
    maintenance
    A Model Context Protocol server implementation for Axiom that enables AI agents to query your data using Axiom Processing Language (APL).
    Last updated
    60
    MIT

  • Qurio MCP Server

    irahardianto
    A
    license
    -
    quality
    D
    maintenance
    Enables AI coding assistants to search and retrieve information from a locally ingested knowledge base using hybrid search, grounded in user-curated documentation.
    Last updated
    17
    MIT

  • mcp-trino

    txn2
    A
    license
    -
    quality
    B
    maintenance
    A Model Context Protocol server enabling AI assistants to query and explore data warehouses via Trino, with optional semantic context from metadata catalogs.
    Last updated
    2
    Apache 2.0

  • tailscale-mcp-server

    pnocera
    A
    license
    -
    quality
    D
    maintenance
    An MCP (Model Context Protocol) server for managing Tailscale resources using the official Tailscale Go client library v2. This server provides complete coverage of the Tailscale API with enhanced, self-descriptive tools powered by OpenAPI documentation.
    Last updated
    2
    MIT

  • Storyden

    Southclaws
    A
    license
    -
    quality
    A
    maintenance
    A modern community hub with forum and knowledge base. Native MCP built-in, ready for the next era of internet culture.
    Last updated
    323
    Mozilla Public 2.0

  • LLM Optimizer

    jonradoff
    A
    license
    -
    quality
    B
    maintenance
    LLM Optimizer is an AI visibility intelligence platform. It analyzes how large language models and AI search engines perceive, cite, and recommend brands; then provides research-backed optimization strategies to improve that visibility.
    Last updated
    8
    MIT

  • M.I.M.I.R - Multi-agent

    orneryd
    A
    license
    -
    quality
    C
    maintenance
    Provides AI assistants with persistent graph database memory using Neo4j, enabling task management, relationship understanding, semantic search with embeddings, file indexing, and multi-agent coordination through the Model Context Protocol.
    Last updated
    7
    277
    MIT

  • Multi Database MCP Server

    FreePeak
    A
    license
    -
    quality
    D
    maintenance
    The Multi DB MCP Server is a high-performance implementation of the Database Model Context Protocol designed to revolutionize how AI agents interact with databases. Currently supporting MySQL and PostgreSQL databases.
    Last updated
    399
    MIT

  • mcp_demo

    ropon
    A
    license
    -
    quality
    D
    maintenance
    mcp demo ip query
    Last updated
    Apache 2.0

  • Gortex

    zzet
    A
    license
    -
    quality
    B
    maintenance
    High-performance code graph and code intelligence engine. Index code base into knowledge graph, supports 257 languages and native multi repositories environment
    Last updated
    953
    Apache 2.0

  • Memento

    scrypster
    A
    license
    -
    quality
    C
    maintenance
    Provides persistent memory for AI tools by building a local knowledge graph from conversations, enabling cross-session recall and context awareness without cloud dependencies.
    Last updated
    9
    MIT

  • BioBTree

    tamerh
    A
    license
    -
    quality
    A
    maintenance
    A unified biomedical graph database that integrates 50+ primary data sources — genes, proteins, compounds, diseases, pathways, and clinical data — into a single queryable graph with billions of cross-reference edges. Its native MCP server gives LLMs direct access to structured, authoritative biomedical data, complementing their reasoning with reliable identifiers and up-to-date database content.
    Last updated
    19
    AGPL 3.0

  • Anvil MCP Server

    sable-inc
    F
    license
    -
    quality
    F
    maintenance
    Enables AI assistants to manage Sable AI voice agents, journeys, knowledge bases, deployments, and analytics through natural language, plus observability via HyperDX.
    Last updated