Xandikos

Xandikos is a lightweight CalDAV/CardDAV server written in Python that stores calendar and contact collections in a backing Git repository. It provides WebDAV-based access to calendars (CalDAV) and address books (CardDAV) while keeping automatic history via Git commits.

Key Features

• Implements CalDAV and CardDAV server functionality with WebDAV foundations and synchronization extensions for efficient client sync.
• Uses a Git repository as the storage backend so calendar and contact changes are recorded as Git history, enabling versioning and simple backups.
• Written in Python and using Jinja2 for templating; dependencies include Dulwich, icalendar, and defusedxml (as noted in project documentation).
• Supports key WebDAV/CalDAV RFCs (CalDAV and CardDAV fully implemented; core WebDAV largely implemented with some omissions such as LOCK operations and partial support for versioning extensions).
• Designed to run under WSGI/uWSGI and can be fronted by common web servers for authentication and production deployment.
• Tested interoperability with common CalDAV/CardDAV clients and synchronization tools.

Use Cases

• Personal or small-team calendar and contact hosting where Git-backed history and simple deployment are desired.
• Keeping an auditable history of calendar/contact changes for backups or forensic inspection.
• Integrating CalDAV/CardDAV access into environments where storing data as files in Git repositories fits existing workflows.

Limitations and Considerations

• No multi-user account management; primarily intended for single-user or shared-repo setups where per-user isolation is not required.
• Does not implement CalDAV scheduling extensions and lacks some WebDAV features (for example, LOCK operations are not implemented and versioning extensions are only partially supported).

Xandikos is a pragmatic, file-oriented CalDAV/CardDAV server focused on simplicity and Git-backed history. It is suitable when Git-based storage and straightforward CalDAV/CardDAV compatibility are more important than full multi-user or advanced CalDAV scheduling features.