Open Source Alternatives to CalendarBridge

A calendar synchronization tool that mirrors events between multiple calendar accounts in real time. It is designed for professionals who manage separate work and personal calendars to prevent scheduling conflicts by keeping availability updated across different platforms. The software operates as a cloud service that connects to various calendar providers to automate the duplication of events, ensuring that time blocks are consistent across all connected accounts. It is used to maintain a single source of truth for scheduling without the need to manually copy appointments or share private calendar details with others. This automation helps users avoid double booking and simplifies the process of managing multiple professional and personal identities. The tool functions in the background to provide continuous updates to all linked calendars.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to CalendarBridge give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 1 open source alternative to CalendarBridge. The most popular is Keeper. It uses the AGPL-3.0 license and ships an official Docker image.