Best MCP Servers for RAG & Knowledge Retrieval (September 2026)

Nerq found 1,421 MCP servers for rag & knowledge retrieval, ranked below by GitHub stars and weighted compliance score across 52 global AI jurisdictions. The top-ranked MCP server for rag & knowledge retrieval is enuno/unifi-mcp-server with 42 stars and a trust score of 75/100. MCP servers for building RAG pipelines: chunking, embedding, retrieval, and augmented generation.

1,421 servers in this category | Data from Nerq

Top 20 MCP Servers for RAG & Knowledge Retrieval

#	Name	Stars	Trust	Author	License	Description
1	enuno/unifi-mcp-server	42	B 75	enuno	Apache-2.0	An MCP server that leverages official UniFi API
2	kreuzberg-dev/kreuzberg	6,387	B 74	kreuzberg-dev	MIT	A polyglot document intelligence framework with a Rust core. Extract text, metadata, and structured
3	VectifyAI/pageindex-mcp	218	B 73	VectifyAI	MIT	MCP server for PageIndex. PageIndex is a vectorless reasoning-based RAG system which uses multi-step
4	chunkhound	1,041	B 71	chunkhound	N/A	Local first codebase intelligence tool using Python and various libraries.
5	io.github.VZezelin/signal-lab-apify-tools	0	B 71	https://github.com/VZezelin/first	N/A	Run Signal Lab Apify Actors for price tracking, keywords, RAG, transcripts, Reddit, jobs, and menus.
6	nocturne_memory	571	B 70	Dataojitori	N/A	Nocturne_memory is a lightweight, reversible, and visualizable AI add-on memory library.
7	virtualization-mcp	1	B 70	sandraschi	MIT	VirtualBox management MCP server with comprehensive VM operations, networking, storage, snapshots, a
8	softerist/heuristic-mcp	10	B 70	softerist	MIT	Enhanced MCP server for semantic code search with call-graph proximity, recency ranking, and find-si
9	beelzebub	1,833	C 69	mariocandela	N/A	A secure low code honeypot framework leveraging AI for system virtualization.
10	cz.cenaodhad/cenaodhad	0	B- 69	https://cenaodhad.cz/mcp	N/A	Prague apartment prices from the Czech land registry: median CZK/m2 by district, estimates, rankings
11	medha-mcp	11	C 68	tejzpr	MPL-2.0	Medha MCP server offers persistent, git-versioned memory storage for LLM applications.
12	ApeRAG	1,060	C 68	apecloud	N/A	ApeRAG is a production-ready GraphRAG with multi-modal indexing.
13	Coff0xc/AutoRedTeam-Orchestrator	154	C 68	Coff0xc	NOASSERTION	AI-Driven Automated Red Team Orchestration Framework \| AI驱动的自动化红队编排框架 \| 101 MCP Tools \| 2000+ Payloa
14	i3T4AN/Vector-Knowledge-Base	21	C 68	i3T4AN	MIT	A semantic search engine that transforms your documents into an intelligent, searchable knowledge ba
15	mhalder/qdrant-mcp-server	21	C 68	mhalder	MIT	MCP server for semantic search using local Qdrant vector database and OpenAI embeddings
16	innomon/yzma-duckdb-rag	3	C 68	innomon	MIT	A Retrieval-Augmented Generation (RAG) system implemented in Go
17	io.github.pipeworx-io/analyst-ratings	0	B- 68	https://github.com/pipeworx-io/mcp-analyst-ratings	N/A	Analyst Ratings — today's US stock analyst upgrades, downgrades, coverage initiations and…
18	io.github.kadopi/agent-card-health-check	0	B- 68	https://github.com/kadopi/my-projects	N/A	Free no-storage MCP that checks A2A Agent Card connection readiness for authorized targets.
19	io.github.dornansgar390-hue/energy-oracle	0	B- 68	https://github.com/dornansgar390-hue/energy-oracle-group	N/A	PJM/MISO energy arbitrage. Intel TDX attested, on-chain every 60 min. MCP tools for AI agents.
20	cbcoutinho/nextcloud-mcp-server	128	C 67	cbcoutinho	N/A	Nextcloud MCP Server

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About MCP Servers for RAG & Knowledge Retrieval

MCP servers for building RAG pipelines: chunking, embedding, retrieval, and augmented generation. Nerq tracks 1,421 MCP servers in the rag & knowledge retrieval category, each assessed against 52 global AI regulations including the EU AI Act, US state AI laws (California SB53, Colorado SB205), UK AI Bill, and more. Compliance scores are weighted by jurisdiction penalty severity — jurisdictions with higher fines (like the EU AI Act at up to €35M) have more impact on the score than voluntary frameworks.

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