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"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP servers:

  • A
    license
    Not graded
    quality
    B
    maintenance
    Model Context Protocol servers for Microsoft 365, enabling AI assistants to interact with Calendar, Contacts, OneDrive, Outlook, and SharePoint via the Microsoft Graph API.
    MIT
  • F
    license
    B
    quality
    D
    maintenance
    Enables Claude to manage Google Calendar events, schedules, and meetings through natural conversation. It supports viewing calendars, creating Google Meet events, and searching for upcoming activities using Nango for authentication.
    6
  • A
    license
    Not graded
    quality
    C
    maintenance
    Exposes the Appointment Scheduler API to AI agents as an MCP server, enabling them to list users and services, check availability, book, list, and cancel appointments via natural language.
    Apache 2.0
  • A
    license
    A
    quality
    A
    maintenance
    Measures the shape of idle time in a booking calendar. Separates gaps that can actually be sold from structurally unsellable dead time, accounting for turnover time and the booking start grid. Fully offline, no API key required.
    4
    MIT
  • F
    license
    A
    quality
    C
    maintenance
    MCP server that wraps the AddEvent Calendar & Events API v2, allowing Claude to create, search, retrieve, update, and delete events, calendars, and RSVP attendees, plus list timezones.
    16
  • A
    license
    A
    quality
    A
    maintenance
    Provides Japanese business day calculations: add or subtract business days, count between dates, check whether a date is a business day, and reverse-calculate deadlines. Handles national holidays and year-end periods fully offline with no API keys required.
    4
    MIT
  • A
    license
    A
    quality
    D
    maintenance
    Enables intelligent integration with Gmail and Google Calendar for context-aware email analysis, advanced searching, and personalized response drafting. It supports natural language interactions for managing communication history, detecting events in emails, and creating calendar entries.
    17
    MIT
  • A
    license
    A
    quality
    B
    maintenance
    An unofficial MCP server for Tend dental that aims to let users access their own Tend account data (e.g., appointments) via natural language. Currently it is scaffold-only with stub API calls and not yet functional.
    2
    102
    MIT
  • F
    license
    A
    quality
    D
    maintenance
    MCP server integrating with When2Work scheduling API, enabling AI assistants to query employee schedules, shifts, time off, and reports via a set of tools.
    7