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"Free APIs and services without commercial fees" matching MCP servers:

  • SheetsData MCP

    octoco-ltd
    A
    license
    A
    quality
    B
    maintenance
    Provides AI agents with instant, structured access to electronic component datasheets, pinouts, and electrical specifications without requiring PDF uploads. It enables seamless part searching, design validation, and side-by-side component comparisons across major hardware providers.
    Last updated
    12
    84
    8
    MIT

  • embedded-mcp

    atillab1
    A
    license
    A
    quality
    C
    maintenance
    Lets AI assistants read, command, and debug microcontrollers over a serial connection via MCP. Provides tools for serial port discovery, reading serial output, sending commands, and decoding register values.
    Last updated
    7
    1
    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.
    Last updated
    3
    6
    MIT

  • embedcalc-mcp

    ethan-hub26
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    license
    A
    quality
    C
    maintenance
    MCP server providing embedded engineering calculators and code generators as tools for AI agents, enabling precise, deterministic embedded math and C code generation.
    Last updated
    29
    422
    MIT

  • fw-context-mcp

    turbyho
    A
    license
    A
    quality
    A
    maintenance
    Exposes tools for AI assistants to query a persistent SQLite+FTS5 index of C/C++ symbols parsed from real build commands, enabling sub-millisecond lookup, full-text search, and natural-language explanation without hallucination.
    Last updated
    33
    3
    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.
    Last updated
    6

  • 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.
    Last updated
    13
    2
    3
    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.
    Last updated
    14

  • Sigmatek LASAL MCP Server

    Svel26
    F
    license
    A
    quality
    B
    maintenance
    Automates the Sigmatek LASAL software suite for PLC and HMI engineering, enabling AI assistants to inspect projects, apply structural changes, compile, download to hardware, and control PLC runtime.
    Last updated
    21

  • io.github.microhenrio/openocd

    microhenrio
    A
    license
    A
    quality
    B
    maintenance
    Debug microcontrollers directly from Claude. This is an MCP server that drives OpenOCD, letting Claude flash firmware, control execution, and inspect a running target — and read your variables and peripheral registers by name instead of raw addresses.
    Last updated
    39
    4
    MIT

  • openocd-mcp

    luiox
    A
    license
    A
    quality
    B
    maintenance
    An OpenOCD debug MCP server that manages debugging targets and sessions by reusing VS Code launch configurations. It enables firmware flashing, GDB command execution, and real-time status monitoring of embedded systems.
    Last updated
    8
    5
    MIT

  • FTC Toolchain

    Sanjit-K
    A
    license
    A
    quality
    B
    maintenance
    MCP server enabling AI agents to search FTC SDK samples, scaffold OpModes, build and deploy TeamCode to REV Control Hub, and read robot logs for a full code-robot-debug loop.
    Last updated
    35
    MIT

  • pyocd-debug-mcp

    konbakuyomu
    A
    license
    A
    quality
    D
    maintenance
    Enables AI tools to perform full-featured embedded microcontroller debugging via pyOCD and CMSIS-DAP probes, including probe management, flashing, breakpoints, register/memory access, fault analysis, and RTT communication.
    Last updated
    58
    1
    MIT

  • canbus-mcp

    harrisonfaulkner
    F
    license
    A
    quality
    C
    maintenance
    A CAN bus reverse engineering MCP server for Claude Code that lets Claude read, analyze, and map CAN bus messages from automotive and motorsport ECUs directly from the conversation.
    Last updated
    21
    1

  • 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.
    Last updated
    7
    1
    MIT