"Search for free open-source software" matching MCP servers:

Enables assistants and agents to query calendar availability from Google, Outlook, iCloud, or ICS feeds and return free time slots for specified days, date ranges, or pasted messages. It exposes read-only tools for finding availability and checking calendar readability without exposing calendar addresses.

Enables an agent client to build a single-day shop handover plan and check whether entered tasks have coverage, surfacing exact time overlaps and other blockers that prevent a workable handover. Supports version-checked assignment, simulated helper acceptance, cancellation, time correction, and scope confirmation, reopening affected duties when a helper drops out while leaving the rest intact.

Enables AI assistants to book meetings, check availability, and manage Cal.com scheduling through natural conversation.

Enables AI assistants to search, read, compose, and manage Thunderbird mail, filters, contacts, and calendar events through the Model Context Protocol.

Enables ChatGPT Dot to subscribe to cloud-collected Feishu message, task, calendar, and NetEase enterprise email-header events so it can remind users to reply, decide, or follow up. It runs as a self-hosted OAuth/MCP server with read-only source collection and webhook delivery.

Enables AI assistants to read, search, organize, and draft email, manage calendar items, and look up contacts through the user's already signed-in classic Outlook desktop app on Windows, with outgoing actions defaulting to drafts for review.

Enables a family and ranch to manage shared calendars, chores, lists, supplies, animal locations, approvals, and connected devices through MCP tools and interactive Echo Show screens, with account-linked permissions and automations.

Enables AI agents to browse, search, and book meeting rooms across multiple buildings with realistic seed data and conflict detection.

Enables AI apps to read a student's Moodle courses, upcoming and overdue due dates, assignment submission statuses, course grades, gradebook items and announcements. It is strictly read only, so it can never submit, edit or delete anything.

Enables Claude Desktop users at the University of Ghana to read their own Sakai courses through safe, read-only tools — checking deadlines, announcements, calendars, assignments, feedback and grades, and extracting text and page images from lecture slides for study, planning and revision.

Enables AI apps to read a student's courses, due dates, grades, missing work, announcements, modules, discussions, syllabus, and calendar events in a read-only way. It cannot submit, edit, or delete anything, and credentials go only to the user's own school.

Lets Cursor's AI agent read a public Google Calendar through the Model Context Protocol, so users can ask natural-language questions about events and schedules.

Provides persistent memory, calendar integration, task management, and proactive assistance for Alexa+ through the Model Context Protocol.

Empowers AI assistants with real-world capabilities including note management, Gmail integration, Google Calendar and Tasks management, and Git repository operations through the Model Context Protocol.

Enables agents to discover events, purchase tickets, and set reminders through MCP tools.

Enables voice-driven appointment booking for small businesses, letting customers check availability, book, reschedule, and cancel appointments through any MCP client.

Dingtalk MCP Server

A hosted MCP server that allows AI assistants to access Google Calendar and Sheets via OAuth proxy, requiring no Google Cloud setup.

Enables AI assistants to interact with Apple Notes, Reminders, and Calendar on macOS through MCP, all locally without API keys.

MCP server giving Claude access to Tuta mail, calendar, contacts and drive. Supports mail modes (dedicated/shared/folder), trusted sender filtering with E2E verification, and Docker-based setup.

Enables AI assistants to manage GoHighLevel CRM data including contacts, conversations, opportunities, calendars, and forms through MCP tools and resources.

Enables AI clients to query University of Maryland data and services, including course catalogs, grade distributions, sections and instructors, dining menus, Shuttle-UM routes, athletics, campus events, and the campus directory. Supports signing in with a UMD Directory ID so students can access personalized Schedule of Classes, Testudo, and ELMS information.

A Model Context Protocol (MCP) server for interacting with Microsoft 365 and Microsoft Office services through the Graph API.

A macOS-only MCP server that lets Claude read and create events in Apple Calendar, list calendars, and find free time using EventKit.

Provides real, official public holiday data for ~100 countries with tools to list holidays for a year and check if a specific date is a holiday. Free, no API key required, powered by Nager.Date.

An MCP server for Apple iCloud Calendar over CalDAV, supporting list, search, create, update, delete, RSVP, and free-time finding without local macOS dependencies.

MCP server for Apple Calendar and CalDAV providers. Enables listing, creating, updating, deleting events, and checking free/busy status with per-calendar write protection.

Enables full CRUD operations on calendar events, free/busy queries, and availability slot finding via CalDAV, supporting Nextcloud, Radicale, iCloud, and other RFC 4791-compliant servers.

Serves Claude Desktop a unified, actionable read of Google Calendar and Google Tasks, surfacing overdue items first, then the day's events, free slots, and open tasks, with explicit-request-only write tools for creating, updating, completing, and deleting. Google stays the sole source of truth with no server-side storage beyond the OAuth token and a 30-second read cache.

Enables AI assistants to work with local .ics calendar files over MCP, including agenda and search, free-time and conflict detection, DST-correct recurrence, and byte-preserving safe edits without accounts or network access.

Your real mailbox and calendar for your AI agent — Microsoft 365 via Graph or any IMAP — as 24 tools: read, search, attachments as text, sender history, drafting from identity and knowledge files, free-slot computation. Send, reply, delete and calendar writes need out-of-band human approval: the agent cannot approve its own actions.

Enables an agent to read and manage calendars across Nextcloud, iCloud, Google and any CalDAV server, merging every account into one sorted view. Exposes tools for listing and searching events, finding free time, and creating, updating or deleting events, with secrets kept out of the config.

Free, keyless MCP server for timezone conversion, world clock, DST-aware date arithmetic, and cross-timezone meeting scheduling using IANA timezones.

Muslim Prayer Reminder MCP is a free, open-source server for calculated Muslim prayer times in AI assistants. It supports location and regional calculation methods, daily timetables, next-prayer countdowns, and local or remote MCP clients.

Enables AI agents to find open times on YouCanBookMe booking pages, book, reschedule and cancel bookings, and report on bookings, cancellations and no-shows in natural language.

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.

MCP server that lets you talk to your GoHighLevel sub-account in plain English, offering six tools to search contacts, list calendars, check free slots, and book appointments with dry-run safety and explicit error messages.

Enables MCP-aware AI clients to call AgentDraft's per-agent inbox, conflict-free calendar booking, and tamper-evident audit trail as tools.

Gives AI agents read-only access to patient context on any FHIR R4 server, including journey timelines of encounters and appointments, open booking slots, and discharged patients whose follow-ups were never booked. Search, appointment, and follow-up tools return compact summaries, so agents can answer front-desk and outreach questions without write access.

Enables AI assistants to answer a small business's customer questions from its own FAQs and order data, list upcoming open appointment times in the business's time zone, and book one of those offered slots with staff notification. Free for the first 1,000 businesses, using fast rule-based FAQ matching rather than free-form generation.