Open-source Zoho Calendar alternatives

Cal.diy is a community edition of Cal.com, the scheduling platform, released as open source. It is a fork with all enterprise and commercial code removed, and the whole codebase is licensed under MIT with no proprietary Enterprise Edition split. It is built with TypeScript, Next.js, tRPC, Tailwind CSS and PostgreSQL through Prisma.

Compared with Cal.com, it drops enterprise features such as Teams, Organizations, Insights, Workflows and SSO/SAML, and it needs no license key or Cal.com account. Contributions go directly into this community-maintained project. No hosted service exists, so you run it yourself on infrastructure you control.

The maintainers warn that it is intended for personal, non-production use and that running it yourself demands solid skills in server administration, databases and protecting sensitive data. For commercial or enterprise needs they point to Cal.com instead. Cal.diy suits individuals and tinkerers who want complete control over their own scheduling setup.

Radicale is a lightweight CalDAV and CardDAV server for sharing calendars, to-do lists and contacts. It speaks CalDAV, CardDAV and HTTP, handles events, todos, journal entries and contact cards, and works with many calendar and contact clients.

It is meant to work out of the box without complicated setup. Access can be limited through authentication, connections can be secured with TLS, and all data is kept on the file system in a simple folder structure. Behavior can be extended with plugins, and the project provides documentation, a wiki and a discussion board.

Radicale is written in Python and distributed as free software under GPL-3.0. Because it needs only a file system for storage, it suits individuals, families and small teams who want to host their own calendar and address book instead of depending on a hosted provider.

Baikal is a calendar and contacts server that implements the CalDAV and CardDAV protocols. It lets you host your own calendars and address books and sync them with clients that speak those standards. It is written in PHP, based on the sabre project, and licensed under GPL-3.0. The latest release listed is 0.12.1.

Installation, upgrading and troubleshooting information is on the sabre.io project page. The README also links two detailed community tutorials written for people with little IT experience: a German guide that sets up Baikal on a Raspberry Pi and covers Thunderbird, Android with DAVx5, sharing calendars, database maintenance and security, and a French guide covering installation on Debian and iOS clients.

Baikal was created by Jérôme Schneider of Net Gusto together with fruux and is now developed by volunteers. It suits individuals, families and small groups who want to keep calendars and contacts on their own server rather than with a large provider. Upgrade instructions are provided for moving between versions.

Manage My Damn Life (MMDL) is a self-hosted front end for managing CalDAV tasks and calendars. It is a web app, built with Next.js, that talks to your existing CalDAV server, so your tasks and events stay on the server you already run. The project is in beta, so caution is advised with production data.

It supports subtasks and many task fields such as due date, status, description and recurrence, calendar event management, multiple CalDAV accounts and multiple user accounts. Tasks can be viewed as a list, in a Gantt view or on a calendar, and you can create task filters to see them as you prefer. It has OAuth support for CalDAV accounts, with Google Calendar supported, and a desktop-first, somewhat responsive layout. Planned features include full RFC 5545 field support, drag and drop, customizable views and plugins.

MMDL has been tested with Nextcloud, Radicale and Baikal and should work with servers supported by the tsdav library. It is licensed under GPL-3.0 and uses Weblate for translations.