s I plan to move from a proprietary calendaring to a more „ressource-aware” open source solution, I decided to give Radicale a try. It is open source, appears to be rather pragmatic in its approach to „standards” and has a small footprint in regards to system requirements.

With me running Debian 8 on my server, I decided to stick with the available package and not install „from source”. So a quick „apt-get install radicale” took care of installing the necessary software (do not forget to enable the Radicale daemon in /etc/default/radicale).

The configuration of Radicale is rather straightforward and simple. In regards to transport security, You can reuse an existing TLS certificate (or get a new one from Let’s encrypt). For authentication, you can choose between several options. As I don’t have an LDAP server (yet) and I didn’t want to create a .httpasswd entry for each user, I chose „IMAP”. So Radicale will validate all credentials against the local IMAP server (Dovecot in my case).

CalDAVTester is a test and performance application designed to work with CalDAV and / or CardDAV servers and tests various aspects of their protocol handling as well as performance.

CalDAVTester basically executes HTTP requests against a server and verifies the responses returned by the server. Suites of tests are defined in xml configuration files, and an additional xml configuration file is used to define variables used whilst running (e.g., server address, user accounts to use etc).

A test suite configuration file comprises the following items:

A start section where resources needed for the tests can be created
A set of test suites, comprising:
    A set of tests, each of which can have:
        A set of HTTP request/response/verify tests.
An end section to do clean-up after the tests are all done.

The source code to CalDAVTester is available via GIT.

The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.

Calendars and address books are available for both local and remote access, possibly limited through authentication policies. They can be viewed and edited by calendar and contact clients on mobile phones or computers.

Radicale aims to be a light solution, easy to use, easy to install, easy to configure. As a consequence, it requires few software dependencies and is pre-configured to work out-of-the-box.

Radicale runs on most of the UNIX-like platforms (Linux, *BSD, MacOS X) and Windows. It is free and open-source software, written in Python, released under GPL version 3.

• two-way-synchronization (server ↔ client, server always wins)
• focused on simplicity, security and privacy
• supports contacts, calendars (events) and tasks (to-dos)
• lightweight application, not cluttered with "features"
• flawless integration with device and address book/calendar apps
• high-performance algorithms
• seperately usable (either CalDAV or CardDAV)
• free and open-source software (FOSS)

DAViCal is a server for calendar sharing. It is an implementation of the CalDAV protocol which is designed for storing calendaring resources (in iCalendar format) on a remote shared server.

An increasing number of calendar clients support the maintenance of shared remote calendars through CalDAV, including Mozilla Calendar (Sunbird/Lightning), Evolution, Mulberry, Chandler, and various other closed-source products such as Apple's iCal and iOS.

Enrico Zini/ 2014/ calypso-davdroid

Calypso is a python-based CalDAV/CardDAV server that started as a few small patches to Radicale but was eventually split off as a separate project.