
Keeper.sh is an open-source (AGPL-3.0) calendar management & syncing utility, and allows you and your agents to view and manage your calendars & events, whether it be Google Calendar, Outlook, Microsoft 365, Apple Calendar, Fastmail, CalDAV, ICS and more.
Keeper.sh acts as a universal access-point for all your calendars in one place.
https://www.keeper.sh/mcpNone in the store listings. The server needs sign-in, so we could not check it