If you want a Google Calendar integration that lets you create events from multiple email addresses, fwd2cal is a top contender. This open-source AI calendar assistant can add events to Google Calendar by extracting relevant information from email threads you forward to it. It works with multiple email addresses and protects privacy by not storing emails, only logging email addresses. People can sign up by emailing calendar@fwd2cal.com and granting permission to their Google Calendar to start scheduling appointments.
Another tool worth a look is Cognosys, an AI-powered assistant that automates tasks and helps you work more efficiently. It can integrate with Google Calendar, along with other tools like Gmail and Notion, to set up automated workflows and email processing. Although it's geared more toward full-featured workflow automation, its integration with Google Calendar can help you schedule events and appointments.