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"Services or tools that don't require a separate API key" matching MCP servers:

  • serial-mcp

    alxgmpr
    A
    license
    A
    quality
    A
    maintenance
    MCP server that lets LLMs talk to serial devices: microcontrollers, routers, modems, embedded Linux, anything with a UART.
    23
    4
    MIT

  • nrf-mcp

    pshanesmith
    A
    license
    A
    quality
    D
    maintenance
    An MCP server for Nordic nRF Connect SDK development that enables users to list, read, and search documentation and sample code from the nrfconnect/sdk-nrf repository. It provides Claude with specialized tools to navigate SDK resources, source files, and configuration examples directly through the GitHub API.
    3
    15
    MIT

  • silotek-serial-mcp

    JOCOIN94
    F
    license
    A
    quality
    B
    maintenance
    A headless MCP server that enables AI tools (like Claude Code) to read and analyze serial logs from embedded boards (ESP32, STM32) for firmware debugging, with read-only tools for log retrieval and a built-in web viewer.
    6
  • ak-mcp by the-ak-foundation

    ak-mcpofficial

    the-ak-foundation
    A
    license
    A
    quality
    A
    maintenance
    Provides AI coding tools with queryable documentation for the AK (Active Kernel) event-driven MCU framework, including API signatures, guides, and guardrails.
    8
    Apache 2.0

  • siglent-sds-mcp

    MagnusJohansson
    A
    license
    A
    quality
    D
    maintenance
    An MCP server that enables AI assistants to control Siglent SDS oscilloscopes over a local network using SCPI commands. It allows users to measure signals, configure channel and acquisition settings, and capture waveforms or screenshots through natural language.
    13
    6
    6
    MIT

  • pixelblaze

    tomnz
    F
    license
    A
    quality
    D
    maintenance
    Enables Claude to create, update, and manage LED patterns on a PixelBlaze controller, including setting brightness and reading device info, through a set of tools that interact with the device's API.
    14

  • UGS-MCP

    zackpeters93
    A
    license
    A
    quality
    B
    maintenance
    MCP server for controlling CNC machines via Universal GCode Sender. Lets Claude (or any MCP-compatible AI assistant) connect to a CNC machine, inspect G-code, and issue motion commands — all through the UGS Pendant REST API.
    19
    5
    MIT

  • OBD MCP Server

    ayhammouda
    A
    license
    A
    quality
    B
    maintenance
    A local-first, read-only MCP server for vehicle diagnostics that exposes structured OBD-II tools for reading PIDs, DTCs, and ECU snapshots without raw protocol access.
    7
    Apache 2.0

  • siglent-sdg-mcp

    MagnusJohansson
    A
    license
    A
    quality
    D
    maintenance
    MCP server that lets AI assistants control Siglent SDG waveform generators over a local network using natural language, supporting signal generation, modulation, sweep, burst, and arbitrary waveforms.
    21
    8
    MIT

  • ros-mcp

    husain-zaidi
    A
    license
    A
    quality
    D
    maintenance
    A Model Context Protocol (MCP) server for ROS 2 that enables GitHub Copilot and other AI agents to interact with ROS 2 systems. This server provides tools for monitoring, debugging, and managing ROS 2 nodes, topics, services, and TF2 frames.
    15
    48
    MIT

  • BLE MCP Server

    es617
    A
    license
    A
    quality
    C
    maintenance
    A stateful Bluetooth Low Energy (BLE) MCP server that enables AI agents to scan, connect, read/write characteristics, and subscribe to notifications on BLE devices.
    35
    15
    MIT

  • KiCad Context MCP

    yigitabi5444
    A
    license
    A
    quality
    A
    maintenance
    A read-only MCP server for AI agents to understand KiCad projects through progressive disclosure, providing compact summaries and drill-down tools for components, nets, traces, and ERC/DRC checks without blowing context budgets.
    7
    1
    MIT

  • ROS MCP

    Yutarop
    A
    license
    A
    quality
    D
    maintenance
    Enables controlling robots in ROS environments through natural language, supporting topics, services, actions, and GUI tools.
    24
    35
    MIT

  • GDB MCP Server

    zjm1060
    F
    license
    A
    quality
    D
    maintenance
    Enables AI agents to debug embedded systems by providing a comprehensive interface for GDB operations across multiple architectures like ARM and x86. It supports remote debugging via gdbserver or QEMU, allowing for detailed inspection of memory, registers, stack frames, and variables.
    31