"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

DXF and PDF/X-4 for AI agents: structured facts, PNG renders, an interactive in-chat viewer.

MarkupBase turns AI-generated Markdown and HTML into durable, versioned artifacts that people can review and discuss. Its MCP server lets agents publish new versions, preserve contextual comments, include hosted images, and respond to feedback through secure account-linked identities, creating a clear human review boundary without requiring real-time editing.

AIOProductOS: revenue, feedback, work and analytics on one customer record. 71 tools, 3 apps.

Persistent memory layer that saves and recalls your project context and preferences.

Publish and manage existing HTML presentations from an MCP-capable Agent.

Generate and read PDFs for AI agents: a generate_pdf and a read_pdf tool, priced per document.

DeepMark helps teachers deliver rapid, consistent marking with meaningful feedback for every student — in a fraction of the time. What once took a week, now takes one free period.

Reassign: a circular 24-hour calendar and time-tracking copilot with ADHD-friendly scheduling.

Mila is an AI-native collaborative platform for documents, spreadsheets, and slide presentations. The Mila MCP server lets AI assistants create, read, update, and manage office documents programmatically. 23 MCP tools covering documents, sheets, slides, and servers. Get your API key at https://mila.gg/api-keys.

8 curriculum, classroom, accommodations and exam-prep skill products. 5 of 7 free.

Turn analyzed data into an Excel-like spreadsheet at a shareable URL: formulas, styles, filters.

Let your agent hire humans or other agents, and be hired. Post jobs, take bids, pay on completion.

Publish to self-hosted WordPress from AI agents: markdown, images, SEO, and Notion sync.

Converts between PDF/Office documents and structured JSON, both directions. Pure OSS libraries, x402

Read your team's end-of-day reports and roster from Eodly.

Deterministic, fully editable PowerPoint from typed slide intents. 200+ layouts, brand templates.

Google Keep MCP, read and edit your notes, lists, labels and collaborators. Connect with your Google

AI invoice follow-up emails for freelancers. Draft-only, never sends for you.

Compute real duty rosters from your AI assistant - rule-based vigotime planner, API key or OAuth.

ZapSign electronic document signing via the official API: create documents for signature (from PDF,