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"List of Easy-to-Use Free MCP Servers for Proof of Concept Development" matching MCP servers:

  • of-mcp

    ThiTheGoat
    A
    license
    A
    quality
    C
    maintenance
    Provides MCP tools to search, retrieve, and answer questions from the public Open Finance Brasil Confluence documentation using BM25-based local indexing.
    4
    MIT

  • AI Proof of Us MCP Server

    0xddneto
    A
    license
    A
    quality
    A
    maintenance
    Records privacy-preserving receipts for AI-assisted tasks and enables optional onchain reward claiming via AIPOU tokens. Integrates with MCP-compatible clients like Claude and Cursor.
    9
    3
    MIT

  • library-of-babel-mcp

    slaufer
    A
    license
    A
    quality
    C
    maintenance
    An MCP server that provides access to the Library of Babel, allowing users to retrieve exact page contents by address, search for text to find its location, and generate random pages.
    4
    151
    ISC

  • doctor-of-credit-mcp

    monroedean
    F
    license
    A
    quality
    B
    maintenance
    An MCP server that lets AI clients search and retrieve Doctor of Credit articles, categories, and deals via flexible tools, interpreting article content at request time.
    8
    1

  • world-of-claudecraft-mcp

    u2
    F
    license
    A
    quality
    C
    maintenance
    An MCP server adapter that allows LLM agents to autonomously play World of ClaudeCraft by wrapping the game's headless environment as MCP tools for state reading and action execution.
    7

  • Atom of Thoughts

    dioptx
    A
    license
    A
    quality
    D
    maintenance
    Structured reasoning MCP server that decomposes problems into atomic steps (premise, reasoning, hypothesis, verification, conclusion) with confidence scoring, live visualization, and approval feedback.
    3
    79
    MIT

  • mcp-zen-of-languages

    Anselmoo
    A
    license
    A
    quality
    A
    maintenance
    Enables AI assistants and developers to analyze code for language-specific best practices and idiomatic patterns across programming languages, CI automation, and configuration formats.
    16
    2
    MIT

  • gmail-mcp-send-to-list-only

    bajor
    F
    license
    A
    quality
    A
    maintenance
    An MCP server that sends plain-text Gmail messages only to a predefined allowlist, using generated recipient IDs instead of email addresses to enforce security.
    2
    1

  • Agentic Travel Recommendations

    Beckett-Eiland
    F
    license
    A
    quality
    C
    maintenance
    MCP server that provides AI agents with personalized travel recommendations for members, enforcing partner-specific rules such as category exclusions, loyalty tier eligibility, and recommendation caps.
    3

  • signs-of-ai

    peopleworks
    A
    license
    A
    quality
    A
    maintenance
    Bilingual (EN/ES) AI-writing detection that shows the evidence instead of a percentage: named tells with line and column, hidden-character inspection, and citation cross-checking against a document's own bibliography. Seven of its nine tools run entirely locally and never touch the network.
    10
    20
    MIT

  • Out of Context

    HJeon139
    A
    license
    A
    quality
    D
    maintenance
    An MCP server for managing contextual data as markdown files with metadata, enabling agents to save, retrieve, search, and delete contexts using simple CRUD operations.
    5
    Apache 2.0

  • wg-easy-mcp

    ni-c
    A
    license
    A
    quality
    A
    maintenance
    MCP server for administering wg-easy (WireGuard Easy) instances, enabling listing, creating, updating, enabling/disabling, and deleting WireGuard clients, fetching configs and QR codes, and inspecting server status via the wg-easy REST API.
    11
    0
    MIT

  • x402-list-mcp

    mcccsm
    A
    license
    A
    quality
    B
    maintenance
    Enables AI agents to discover x402 payment services and query on-chain-verified settlement volumes per facilitator through the Model Context Protocol.
    6
    195
    MIT

  • mcp-easy-installer

    onigetoc
    F
    license
    A
    quality
    C
    maintenance
    A robust MCP server with tools to search, install, configure, repair, and uninstall MCP servers, automating setup and maintenance across multiple AI and developer tools.
    4
    17

  • n8n-free-mcp

    jserna0001
    A
    license
    A
    quality
    C
    maintenance
    Free and open-source MCP server for managing n8n workflows, executions, and tags via n8n's API. Enables workflow creation, activation, debugging, and deletion from any MCP client.
    12
    2
    MIT