"Proton Calendar" matching MCP connectors:

Contio MeetingOS: meetings, transcripts, action items, agendas, calendar, and project management.

GDPR-compliant calendar access for AI assistants. Google, Microsoft 365, Apple & more. EU-hosted.

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

Google Calendar MCP Pack

Calendar API for AI agents: events, availability, Google/Microsoft setup, scheduling, and iCal.

Outlook Calendar MCP Pack

Manage Microsoft 365 email, calendar, contacts and inbox rules via the Graph API with OAuth 2.0.

Hosted Google Calendar MCP server for AI agents. No self-hosting or Google Cloud setup.

Streamable HTTP MCP server for Google Calendar and Sheets with OAuth login.