"Free Network Graph Visualization Tools (No Account Required)" matching MCP servers:

Enables assistants and agents to query calendar availability from Google, Outlook, iCloud, or ICS feeds and return free time slots for specified days, date ranges, or pasted messages. It exposes read-only tools for finding availability and checking calendar readability without exposing calendar addresses.

An MCP server for Microsoft Graph, exposing 60 tools across calendar, email, meetings, Teams chat, files, people, directory, tasks, and OneNote over stdio or Streamable HTTP.

Enables Claude to connect unlimited Gmail and IMAP mailboxes, search and triage them together while identifying each account, read attachments, and create drafts or perform permitted mailbox actions under configurable safety modes.

Enables MCP clients to retrieve service version, development status, and work-tracking information via a single tool; contest calendar and rules features are planned but not yet available.

Forked from https://github.com/epaproditus/google-workspace-mcp-server The deletion and updates on Google Calendar were removed since there were no scope to prevent deletion whilst maintaining creation capabilities.

A modular Model Context Protocol server for Microsoft Graph and Microsoft 365, enabling users to manage Teams, mail, calendar, To Do, contacts, and Outlook settings through natural language.

Enables Claude to access and manage multiple Google accounts at once across Gmail, Calendar, Drive, Contacts, and Tasks, with unified search and document text extraction.

An MCP server for managing kids' sports activities on Spond. Built for parents who want to give AI assistants access to upcoming matches, training schedules, and attendance.

Enables Claude to read, search, send, and organize mail and manage calendars across many Gmail and Google Workspace accounts at once, routing each call by account label, address, or domain, or fanning out across all of them. Includes draft-first sending, an optional auto-forward allowlist, health checks, and an audit log.

Enables deterministic calculations for AI API and subscription costs, meeting time zones, recurring schedules, and cron next-run previews, returning normalized inputs, units, assumptions, dated sources, and links to results.

Enables natural language interaction with multiple Google accounts (Gmail, Drive, Calendar) from MCP-compatible clients like Claude.

Enables models to get South Korean public holidays and business-day math right, convert won amounts to and from Korean words, verify business registration check digits, compute 만 나이 and Civil Act deadlines, convert lunar dates, and normalize or mask Korean phone numbers, addresses, names and text byte counts. It runs as a stateless remote endpoint with a free daily quota and no key required.

Model Context Protocol server wrapping Microsoft Graph API for OneDrive, SharePoint, and Calendar with read and write operations, plus Teams meeting transcript support.

Enables a family assistant to search documents, inspect, fill, edit, and sign files, manage scheduled work and runs, and perform web searches, with each tool gated by the caller's groups.

Exposes Korean-language utility tools to AI agents over a stdio MCP server, covering Hangul initial-consonant (chosung) extraction, conversion of integers into Korean currency words, lookup of Korean public holidays, and business-day checks for a given date.

Connects Claude Code and Codex to Microsoft Teams, Outlook mail and calendar, online meetings, OneDrive, users, tasks, and presence through Microsoft Graph, exposing tools for messaging, scheduling, file management, and collaboration operations.

A Model Context Protocol server that enables AI assistants to interact with Microsoft Outlook for calendar management, email operations, and search functionality.

Enables AI assistants to manage Microsoft 365 email, calendar, and contacts through natural language, with zero Azure setup required.

Enables access to Network School Luma calendar events through Claude Desktop. Allows users to view today's events, search upcoming events, and register for events directly with their contact information.

A collection of tools that enable AI assistants to interact with Apple applications and services including Contacts, Notes, Messages, Mail, Reminders, Calendar, Maps, and Web Search through the Model Context Protocol.

Multi-account Google MCP server providing read access to Gmail and Calendar via stdio. Supports secure authentication for personal and work accounts with OAuth and keychain token storage.

Enables MCP clients to securely access and operate a Microsoft 365 tenant through the full Microsoft Graph API, covering mail, calendar, files, Teams, SharePoint, Planner, OneNote, Excel, admin, security, and more with 219 tools and guarded write capability.

Enables AI assistants to interact with Nextcloud instances through secure APIs, supporting operations across Notes, Calendar, Contacts, Files, Deck, Cookbook, and Tables with OAuth2 or Basic Auth.

Connects multiple Gmail and Google Calendar accounts to Claude Desktop locally, enabling email management (search, send, draft, label) and calendar operations (list events, search) via natural language.

A local MCP server that connects multiple Gmail and Google Calendar accounts to Claude Desktop, enabling email and calendar management across accounts.

A local MCP server that connects multiple Google accounts to Claude Desktop, enabling unified email search and send, calendar events, and full CRUD on Google Docs, Sheets, and Forms.

An MCP server for managing Proton Mail, Pass, Drive, and Calendar through local IMAP/SMTP, pass-cli, and Proton Drive CLI, enabling AI agents to operate the mailbox, manage passwords, sync files, and classify emails.

Enables comprehensive calendar management with capabilities to create, list, update, and delete events through a Model Context Protocol server integrated with Google Calendar.

A full-featured Model Context Protocol server that gives AI assistants real-time access to Google Workspace services including Drive, Gmail, Calendar, Sheets, Docs, and Apps Script.

Enables AI agents to interact with Google Workspace services (Gmail, Drive, Docs, Tasks, Calendar) through OAuth 2.0 authentication, providing 25+ operations for business automation and productivity.

Enables Claude to query and manage Mail2000 calendar events, including agenda, search, booking, updating, and deleting events through natural language.

A macOS-only MCP server that lets Claude read and create events in Apple Calendar, list calendars, and find free time using EventKit.

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.

Provides real, official public holiday data for ~100 countries with tools to list holidays for a year and check if a specific date is a holiday. Free, no API key required, powered by Nager.Date.

Enables AI agents and scripts to read and manage events on your account — guest lists with questionnaire answers, CSV export, check-in, approvals, invites and Text Blasts — through your own signed-in Chrome session, with no public API or official integration required. Runs locally over stdio, streamable HTTP, a REST API with OpenAPI docs, and a Python client.

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.

Provides Japanese national holidays, wareki (era) conversion, and date information. Works fully offline with no API keys required.

An MCP server for Apple iCloud Calendar over CalDAV, supporting list, search, create, update, delete, RSVP, and free-time finding without local macOS dependencies.

Create scheduling polls (like Doodle) from AI agents. Find the best time for meetings, dinners, and events. 5 tools: create_poll, get_poll, vote_on_poll, get_results, finalize_poll. No authentication required.

Local-first Microsoft Outlook MCP server: a single Go binary that manages calendar events and mail through the Microsoft Graph API over stdio, with tokens stored in the OS keychain and no Entra ID app registration required. Exposes four aggregate tools (calendar, mail, account, system) dispatched by an operation verb, with multi-account support and read-only and mail-gating modes.