"Free servers available for testing purposes" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Form backend for static sites: create a form and get its HTML snippet, send submissions to email, Discord, Slack or a webhook, then read, moderate and clean up spam. Sign in with OAuth, no API key. MCP works on every plan, including Free.
A phone line for your app or business that answers calls, takes messages and bookings.
Managed LinkedIn MCP server for AI agents: search, connect, message and enrich on accounts you own.
Free hosted MCP server: new Upwork jobs for your agent and Telegram alerts within a minute.
Makes JFPI links: joke links for people who ask questions an AI could have answered.
Email inboxes for your team and your AI agents: addresses, threads, sending and replies.
Mail, Calendar, Messages, Notes, Contacts, Slack on your Mac for AI. Remote needs Pro or free trial.
AI-native email for businesses, developers, and AI agents.
Human-in-the-loop expert for when your agent is stuck: math, optimization, operations research, AI.
Give AI agents own email inbox, SMS numbers, and workspace accounts to receive and send messages.
Send and read real SMS from your own phone number: an Android phone, or an iPhone through a Mac. Send a text or a different text to each person, wait for the reply, read conversations, send pictures (MMS) and check which phones are online. OAuth sign-in; free tier.
Give your AI assistant its own email inbox: send, read and catch sign-in codes. Texting coming soon.
The judgment layer for email. Connect Gmail, Outlook, iCloud, Yahoo and IMAP to AI apps in one MCP connection. Nothing sends until you approve it.
Kite is a no-code Discord bot builder that hosts your bot. Its MCP server lets your AI client build the bot for you: slash commands, event listeners and messages with buttons. It can also edit existing flows, read logs to fix errors, and add ready-made templates like tickets or verification. Changes go live right away, and commands show up in Discord within a minute. It can also read your server through the Discord API, like channels, roles and members. Claude, ChatGPT, Claude Code, Codex and VS Code connect by signing in. You pick which apps the client can access and whether it can make changes. Other clients like Cursor use a Kite API token. Earlier versions of every flow can be restored in Kite.
Zero-shot swarm mailbox, race-safe task contract buffer, and multi-agent coordination node for autonomous AI agents.
WhatsApp for AI agents — your own number or the official Cloud API: messages, media, templates.
WhatsApp OTP and WhatsApp Business automation tools for AI assistants
Hosted WhatsApp MCP server on the official WhatsApp Business API: WhatsApp OTP send/verify (free key, 100/month), templates, conversations, stats and draft automations. Optional X-API-Key header.
A phone number for your business or your AI agent. Kai answers it and calls businesses for you.
Salesbot lets your AI assistant run careful, personal LinkedIn outreach. Find the right people (LinkedIn search, Sales Navigator, company lists, job postings), enrich their profiles and write a personal message for each of them. Nothing is sent until you approve it, or until Salesbot's AI check confirms the name, gender, company and grammar. Campaigns pace invitations and messages within daily and hourly limits that the server enforces, inside your sending hours, so your LinkedIn account stays safe. A built-in CRM keeps the pipeline, notes, tasks and companies, and e-mails go out through Smartlead, Instantly or your own mailbox. Sign in with your Salesbot account (OAuth) or use an API key. Built for a few well-chosen people at a time, not bulk blasting.
Find and call the right MSG91 API for SMS, OTP, WhatsApp, Email and Voice.
Email for long-term client relationships: ARVX reads each person first and remembers every pair.
Live per-minute prices for international calls to mobiles and landlines in 200+ countries with the eFon app (iOS and Android): pay-as-you-go, no subscription, no connection fees, usually up to 90% cheaper than dialing directly on a mobile-operator plan. Compare rates across several countries, get step-by-step dialing instructions with example numbers and the time difference, and find out which country a calling code like +36 or +233 belongs to. Read-only, no API key or sign-in needed.
Read and post to an anonymous Japanese BBS thread made for AI agents to chat with each other.
Chickadee Bandit is a private hub for a household: its members, conversations, and the apps it has installed (calendar, chores, groceries, medications, co-parenting, and more). The MCP server lets an AI assistant work inside that household as the person who connected it. It sees exactly what that person can see, and nothing more.
Invites, guest lists and text blasts for your events.
Dial by Aloha Labs gives an AI agent its own real US or Canadian phone number through one remote MCP server, with no install. Signup is open, and agents can sign themselves up with the sign_up tool. Dial reads incoming verification codes, receives texts, and places AI voice calls with 10 voice personas. Free: $5 credit, no card, OTP codes included. Paid plans start at $15/mo.
Make your agent findable by other AI agents, or find one for a task: search, register, match, chat.
Posts, Notes, messages, subscribers and stats for your publication.
Set up, test and publish an AI customer support Agent for your SaaS product.
