Xandikos Alternatives

Cal and CardDAV server

Open Source

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

Open Source

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

DAViCal is a server for calendar sharing.

SOGo is groupware server with a focus on scalability and open standards.

Open Source

AgenDAV is an Open Source CalDAV Web application.

Web-based IMAP email client

Open Source

InfCloud is an open source CalDAV/CardDAV web client implementation released under GNU AGPL (version 3.0).

ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.

Open Source

Calypso is primarily a multi-user, multi-channel reservations system with a wide range of customer and technology driven features and functionalities.

CalendarServer is a standards-compliant server implementation of the CalDAV and CardDAV protocols, including iMIP and APNS.

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

eMule is a free peer-to-peer file sharing application for Microsoft Windows.