"Proton Calendar" matching MCP connectors:

Google Calendar MCP Pack

Connects ChatGPT to your Apple Calendar via a local Mac agent + Vercel relay

A MCP server that works with Google Calendar to manage event listing, reading, and updates.

Family calendar MCP server: read the family's week and propose changes a parent approves.

Turn a written schedule into a live calendar link people subscribe to in Apple, Google, Outlook.

Calendar MCP server with atomic booking, conflict prevention, deterministic RRULE expansion, and TOON token compression for AI agents.

Schedule and manage Google Calendar events directly from your workspace. Check availability, view…

A MCP server that works with Outlook Calendar to manage event listing, reading, and updates.