"Information about backend development or backend systems" matching MCP connectors:

Official Kudosity Model Context Protocol (MCP) server that allows AI-powered editors (like Cursor and Windsurf) and assistants (like Claude Desktop) to directly explore and execute Kudosity APIs. With MCP, your AI can search API specs, generate code snippets, and run live requests; all without leaving your development environment.

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

Query people, segments, campaigns, and message deliveries; send transactional email or broadcasts.

Group meeting scheduler: Rank everyone’s available times across Google and Outlook, book Meet or Teams meetings between different organizations.

Real-time chat hub for AI agents — Claude Code, Cursor, Cline, Codex over MCP or REST.

Send free or paid faxes to US/Canada from Claude, ChatGPT, and other AI agents.

Give your AI agent a phone. Place outbound calls to US businesses to ask, book, or confirm.

PhoboMail gives AI agents their own @phobomail.com email address with zero human involvement. Agents call `register_email` to get an address and API key, then use `send_email`, `read_inbox`, `wait_for_email` and more — all over MCP. Ideal for agent workflows that need to sign up for services, handle OTP verification, or communicate across sessions. Hosted on Cloudflare.

AI-native form builder with a native MCP server. Describe a form in Claude, ChatGPT, or Cursor, get a live URL back, and read every response in the same thread, no dashboard.

Phone, SMS & email for AI agents. One remote MCP server (Streamable HTTP, OAuth or API-key auth, no local install) exposing call, sms, email, and event tools; also usable via CLI, Python SDK, and OpenAPI. Self-hostable, AGPLv3.

Join.cloud is Slack for AI agents. Create rooms, invite agents, and let them collaborate in real-time. Agents communicate via broadcast messages or DMs, and each room is a standard git repository for code collaboration (clone/push/pull).

Connect your Rock workspace to any MCP client. Your AI assistant can search across all your spaces and read or write messages, tasks, notes, and files, acting as you.

Manage your dedicated AI assistant instances on [OpenClaw Direct](https://openclaw.com) through natural language. Deploy, monitor, and control always-on AI assistants that integrate with Telegram, WhatsApp, Discord, Slack, and Signal — all from your AI coding assistant. Learn more about the [MCP integration](https://openclaw.com/openclaw-mcp-integration).

Send real faxes to EU institutions: pay per fax via checkout link or prepaid API key.

Connect any two AI agents and let them talk directly. Claude to Claude, Claude to OpenAI, or any MCP-compatible agent

Reply.io is a sales engagement platform used by thousands of B2B sales teams to automate multichannel outreach — email, LinkedIn, calls, SMS, and WhatsApp. The Reply.io MCP server exposes the platform's core functionality as tools that any MCP-compatible AI model can call directly. The MCP server is hosted by Reply.io and authenticated via API key. No self-hosting or open-source setup is required.

Choir management for AI assistants: events, RSVP, announcements and sheet music of your choir.

Send and Receive email via your own address at your domain or unlimited free inboxes. Send Email Receive email with Agent routes or webhooks Route email to other addresses Add your custom domain (unlimited mailboxes) Add unlimited inboxes 3K emails sent per month free per domain 50K for $10/month

SeldonFrame is an open-source, MCP-native Business OS. One conversation in Claude Code or Cursor creates a live workspace — website, booking page, intake form, CRM, and an AI receptionist — on a real subdomain in about 3 minutes.

Real-time chat hub for AI agents — Claude Code, Cursor, Cline, Codex over MCP or REST.