"Free Graph and Network Visualization Tools (No API Key Required)" matching MCP servers:

Enables AI CLI agents to interact with WhatsApp using an unofficial multi-device API, supporting messaging, chat/group/channel management, statuses, and an AI-driven inbox without requiring an official API key.

Provides over 1,000 creative ways to decline requests across four categories (polite, humorous, professional, and creative). The MCP server wraps a REST API to help users craft professional rejections through natural language interactions.

Enables a model to call the Microsoft Graph API directly through nine verb-shaped tools with per-user on-behalf-of authentication, so users can read, create, update, delete, search, batch, upload, download, and resolve attachments without server-side business logic or allow-lists.

A social network MCP server that lets AI-powered IDEs connect and interact with other developers through messaging, public feed posts, resource sharing, and user discovery by tech stack.

MCP server that enables Claude Code to communicate with other Claude Code agents over HTTP, allowing users to ask questions about remote codebases or delegate coding tasks.

Global mailbox and address book for AI agents, enabling asynchronous messaging across machines without requiring simultaneous online presence.

Relays a result screenshot to Slack so you can review a coding agent's output without opening the app.

Enables AI assistants to securely access your own Microsoft 365 data—Outlook mail and calendar, OneDrive, SharePoint, Teams chat, To Do, Planner, Entra ID, and Intune—through Microsoft Graph with delegated permissions.

Open end-to-end encrypted messaging protocol and MCP server (a4a-mcp) that gives AI agents a cryptographic address (apub1...) to exchange messages, tasks, and signed agreements directly across NAT without port forwarding.

Enables controlled Microsoft 365 mail workflows including search, read, thread, attachment, and managed draft operations through Microsoft Graph, without sending or modifying messages.

MCP gateway for GREEN-API WhatsApp that lets AI agents send messages, manage instances, and receive notifications via WhatsApp using the Model Context Protocol.

Enables posting, engaging, sending DMs, and reading your own account through the X API v2 with your developer App credentials, while public search remains on Grok's built-in tools.

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

Enables AI assistants to interact with Microsoft 365 through the Microsoft Graph API, including searching Teams messages, managing chats, and sending messages.

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 Code sessions to discover each other as named peers and exchange instant messages across directories, machines, and Docker containers, with durable delivery for offline sessions.

Enables to manage your Outlook mailbox via Microsoft Graph (write access) with delegated permissions, providing MCP tools to create, modify, and send emails, folders, categories, rules, and automatic replies.

Send WhatsApp messages from any MCP client — text, images and files, plus session management and contact checks. Authenticate by scanning a QR code: no Meta Business approval and no WhatsApp Business account required.

MCP server that wraps the Evolution API (WhatsApp) as semantic tools for LLM agents, enabling messaging, chat management, group operations, and instance control via natural language.

Enables multi-account posting, replying, threading, deletes and image/GIF/video uploads through the official X API v2, plus likes, reposts, bookmarks, follows, timelines, search, DMs, Lists and trends. It runs locally over stdio so OAuth tokens and refresh stay on the user's own machine.