"CAE Key for Electronic Invoicing in Argentina" matching MCP servers:

An OAuth-secured remote MCP server (22 tools) that lets Claude, ChatGPT, and Codex search All-In Summit attendee profiles, explore the live agenda, check sessions and meetings, detect scheduling conflicts, and export a calendar. Account-changing actions are only prepared for review, with the user confirming each request in the browser before any event API call is made.

Enables AI assistants to book meetings, check availability, and manage Cal.com scheduling through natural conversation.

Provides persistent memory, calendar integration, task management, and proactive assistance for Alexa+ through the Model Context Protocol.

Empowers AI assistants with real-world capabilities including note management, Gmail integration, Google Calendar and Tasks management, and Git repository operations through the Model Context Protocol.

Enables voice-driven appointment booking for small businesses, letting customers check availability, book, reschedule, and cancel appointments through any MCP client.

A hosted MCP server that allows AI assistants to access Google Calendar and Sheets via OAuth proxy, requiring no Google Cloud setup.

MCP server giving Claude access to Tuta mail, calendar, contacts and drive. Supports mail modes (dedicated/shared/folder), trusted sender filtering with E2E verification, and Docker-based setup.

Enables AI assistants to search, read, compose, and manage Thunderbird mail, filters, contacts, and calendar events through the Model Context Protocol.

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.

Discovers events from Luma's public feed and subscribed calendars, with distance filtering, category search, and ICS export. No API key required for basic discovery.

Provides full access to Microsoft Outlook calendar and email through Claude Code by intercepting browser tokens from an existing signed-in Edge profile, eliminating the need for Azure app registration.

Book a table, an appointment or a place in a class at a real local business. Live availability, instant confirmation, no account and no API key. Eight tools: search, fetch, get_business, check_availability, create_booking, check_booking, cancel_booking and request_listing. Guest emails in eight languages. Hosted at https://g-guest.app/api/mcp

MCP server to list and get events from Evento's public API using an API key.

Allows scheduling meetings in Microsoft Outlook using Microsoft Graph API, with features for creating calendar events and adding attendees by finding their email addresses.

Enables converting moments between IANA zones, answering what time it is in one place when it’s a given time in another, and finding overlapping meeting windows for multiple participants’ work hours, all locally via date-fns-tz/Intl.

Enables LLM agents to operate a CRM through 114 typed tools across 24 modules, covering contacts, pipelines, calendars, messaging, invoicing, and payments. Destructive and outward-facing actions are annotated for visibility and approval.

An unofficial MCP server that enables adding content to daily notes, creating notes, saving links, and scheduling reminders in Reflect from Claude Desktop.

Lets MCP-compatible AI agents manage contacts, deals, pipelines, tasks, automations, messaging, bookings, and reports in a Conduyt account using API-key-scoped access. It also supports discovery, permissions checking, and batch operations.

A minimal Python MCP server that gives Claude access to built-in Apple apps (Mail, Contacts, Calendar, Notes, Reminders) on macOS, leveraging native APIs and local databases for speed with no OAuth setup.