"Free APIs and services without commercial fees" matching MCP servers:

Enables synchronization and management of FoundryVTT journal entries within a Notion Story Bible, including media export and conflict resolution tools. It provides a Model Context Protocol interface for LLMs to preview, apply, and monitor data mirroring between tabletop RPG platforms and digital databases.

Connects AI assistants to your Limitless AI lifelog data, enabling them to search, retrieve, and analyze your recorded conversations and daily activities from your Limitless pendant.

Enables AI agents to store and retrieve project context, bugs, decisions, and session logs by reading and appending markdown files in a local Obsidian vault, without requiring any cloud services.

Enables an AI assistant to browse folders, search and read notes, create and edit them, and move notes between folders within an account. Runs locally through a supported MCP client and supports basic Markdown while refusing edits that would lose existing formatting.

MCP server for Ultrathink: save and search your knowledge base from Claude Desktop, Claude Code, and any MCP client.

A TypeScript-based MCP server that enables users to query financial news, stock data, and index information while managing text notes with creation and summarization capabilities.

Enables local MCP clients to list, read, write, and search notes in an Obsidian vault via an HTTP server running inside Obsidian.

Provides AI clients with per-project todo management and persistent context notes via MCP, enabling task tracking and resume summaries.

Enables AI agents and users to manage workspace files, monitor system metrics, take persistent notes, and retrieve weather data via MCP tools and resources.

Enables AI assistants to maintain a persistent, local memory using SQLite with ranked full-text search, German morphological matching, and two-axis filing, all without external services.

Lets AI clients store, retrieve, update, and forget long-term facts in a local SQLite database with deterministic lexical search, sharing the same memory across multiple clients without relying on model APIs or embedding services.

Enables AI agents to read, write, append, and delete content in Markdown files using structural selectors, without regex or string hacking.

Provides AI agents with per-project note organization inside a single Obsidian vault, enabling them to resolve, write, read, append, list, and search notes without overwriting existing content.

Enables MCP clients to interact with CalDAV calendars, letting users view schedules, find free time, create and update events, manage tasks and dated notes, and respond to invitations on their own server.

Enables an LLM to autonomously maintain a Markdown-based wiki with YAML frontmatter, using hybrid BM25 and local CPU vector search for fully offline retrieval without external APIs or databases.

Exposes Team Vault's REST API as MCP tools for AI agents, enabling programmatic reading and editing of notes without Obsidian.

Enables Claude to interact with Apple services including Email, Calendar, Contacts, Reminders, Notes, Messages, and Safari via AppleScript (macOS) or iCloud protocols.

Read-only semantic retrieval for agents that need to find the right Obsidian note without write access.

Local MCP server that automates an open Obsidian vault through Obsidian's official CLI, offering tools for note creation/update, search, tasks, daily notes, and organization. It uses MCP over STDIO, requires no cloud services, and provides safety/audit features for autonomous writes.

A filesystem-based MCP server for Obsidian vaults that works without Obsidian running, enabling direct file operations via tools like list, read, write, append, and patch notes.

Integrates Apple Notes with AI-powered task extraction and prioritization, enabling automatic processing of notes into actionable items and syncing across multiple productivity services like Google Tasks, Todoist, Notion, and more.

Enables MCP clients to query project-scoped Graphify graphs, search, read, and write Obsidian Markdown notes, and recall or store persistent ICM memories over authenticated private HTTPS. It serializes access per project and supports slim and standard Docker deployments without embeddings or extra memory services.

A macOS MCP server that provides AI agents with secure access to Calendar, Reminders, Notes, and Health data via native Apple APIs.

Enables AI agents on Windows to manage calendar events and reminders over CalDAV and CloudKit, with repeats, alerts, tags, urgent alarms, agenda and free-time planning, notes, and undoable activity logging.

A local, zero-cost MCP server that fact-checks your Markdown/Obsidian notes using a local LLM (via Ollama) and free sources like Wikipedia and DuckDuckGo, with no cloud API or API keys.

Unofficial MCP server for note.com using cookie-based authentication to manage notes and drafts via internal APIs.

A TypeScript-based MCP server that facilitates note management and weather queries. It enables users to create, access, and summarize notes while providing integration for services like flomo.

Lets AI agents search, read and export call recordings, transcripts and AI meeting notes from Digisensus Recorder, a free open-source call recorder for macOS, and start or stop recording. Runs locally on the Mac and talks to the app over a Unix socket.

Enables coding agents to manage Obsidian projects and tasks through MCP tools over stdio, bridging the plugin's local API without needing a secret in client config.

This read-only MCP Server allows you to connect to OneNote data from Claude Desktop through CData JDBC Drivers. Free (beta) read/write servers available at https://www.cdata.com/solutions/mcp