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

  • 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

  • Skill-to-MCP

    biocontext-ai
    A
    license
    A
    quality
    C
    maintenance
    Converts AI Skills (following Claude Skills format) into MCP server resources, enabling LLM applications to discover, access, and utilize self-contained skill directories through the Model Context Protocol. Provides tools to list available skills, retrieve skill details and content, and read supporting files with security protections.
    3
    27
    Apache 2.0

  • gh-mcp

    promplate
    F
    license
    A
    quality
    B
    maintenance
    Refined MCP server for GitHub GraphQL API. GitHub's official MCP Server exposes dozens of low-level tools that bloat token usage and are mostly impractical for LLMs. gh-mcp achieves the best of both worlds by providing a single, powerful interface: GitHub GraphQL, wrapped with smart abstractions.
    2

  • Subscription Sniper — AI Agent

    anmka-j
    F
    license
    A
    quality
    C
    maintenance
    An MCP-powered AI agent that audits your Gmail for recurring subscriptions, detects silent price increases, and flags unused services.
    6

  • business-day-mcp

    fbdo
    A
    license
    A
    quality
    C
    maintenance
    MCP server for business-day arithmetic with country-aware holiday calendars. It offers tools to check, calculate, and list business days and holidays for over 60 countries.
    9
    MIT

  • wasmagent-mcp-server

    WasmAgent
    A
    license
    A
    quality
    A
    maintenance
    Code-mode MCP server (docs_search + execute_code two-tool surface) backed by a unified capability manifest across three sandbox kernels (in-process node:vm, WASM via QuickJS / Pyodide / Wasmtime, and remote microVM via E2B / Cloudflare Sandbox). At N=30 tools the bootstrap-context cost drops to 13.6% of direct tool-use. Apache-2.0.
    2
    5
    Apache 2.0

  • filemaker-mcp

    nietsneuah
    A
    license
    A
    quality
    B
    maintenance
    Enables AI assistants to query, analyze, and discover FileMaker database schemas via OData v4, with pandas-powered analytics for efficient data summaries.
    13
    10
    GPL 3.0

  • Intervals.icu MCP Server

    VSidhArt
    F
    license
    A
    quality
    D
    maintenance
    Enables AI assistants to interact with Intervals.icu fitness tracking and wellness data, allowing users to fetch, filter, and group activities or health metrics. It provides structured summaries of workouts and physical well-being through natural language queries.
    4

  • Kylas CRM MCP Server

    akshaykylas94
    A
    license
    A
    quality
    D
    maintenance
    Enables management of Kylas CRM lead operations, including creating leads, searching and filtering records, and resolving user, product, or pipeline IDs. It provides specialized tools for monitoring idle leads and accessing lead schema instructions through natural language.
    8
    MIT
  • KumoRFM MCP Server by kumo-ai

    KumoRFM MCP Serverofficial

    kumo-ai
    A
    license
    A
    quality
    A
    maintenance
    Enables AI assistants to query KumoRFM for predictive analytics on relational data, including graph management, natural language to PQL conversion, and training-free predictions.
    12
    33
    MIT
  • actors-mcp-server by apify

    actors-mcp-serverofficial

    apify
    A
    license
    A
    quality
    A
    maintenance
    Use 3,000+ pre-built cloud tools from Apify, known as Actors, to extract data from websites, e-commerce, social media, search engines, maps, and more
    10
    17,591
    3,614
    MIT

  • ffdecmcp

    sublimnl
    A
    license
    A
    quality
    D
    maintenance
    MCP wrapper for JPEXS Free Flash Decompiler (FFDec) that exposes SWF decompilation and analysis tools to AI assistants like Claude.
    6
    MIT

  • parchmark-mcp

    TejGandham
    F
    license
    A
    quality
    C
    maintenance
    MCP server for managing ParchMark notes via Claude Code/Desktop. Provides tools to list, get, create, update, and delete notes through natural language.
    5

  • COS-MCP

    adithya-1010010
    F
    license
    A
    quality
    C
    maintenance
    COS-MCP is an MCP server that provides AI-powered organizational continuity planning. It maintains a knowledge graph of employees, systems, projects, and relationships, and exposes tools, resources, and prompts for knowledge graph visualization, risk analysis, employee transition planning, and organizational knowledge base queries.
    12

  • mcp-datetimeday

    cfdude
    A
    license
    A
    quality
    D
    maintenance
    A lightweight MCP server providing comprehensive date, time, and day-of-week information. It supports relative time calculations, timezone conversions, and detailed calendar metadata like week numbers and quarters.
    5
    1
    MIT