Apps to CardDAV

iRedMail is a comprehensive, free, and open-source mail server solution designed for ease of deployment and maintenance. It bundles popular components like Postfix, Dovecot, and Roundcube, providing robust email, calendar, and contact management capabilities.

Tasks is a versatile task management application designed to help individuals and teams organize, track, and prioritize their work effectively. It offers a wide range of features including cloud synchronization, project management tools, and integrations with popular services like Alexa and Dropbox.

Plaxo is a comprehensive online address book and contact management service designed to keep your contacts organized, synchronized, and up-to-date across various devices and platforms. It offers robust features for merging duplicates, integrating with popular services, and providing a unified view of your network.

Microsoft Exchange Server is a robust mail and calendaring server designed for businesses of all sizes, providing enterprise-grade email, calendaring, and contact management capabilities.

Business Calendar is a robust and feature-rich calendar application designed specifically for users who need a powerful and organized way to manage their schedules, events, and tasks. It offers a clear overview of appointments, integrated task management, and extensive customization options to cater to demanding professional needs.

Jorte is a comprehensive calendar and organizer application designed to help users manage their schedules, tasks, and notes efficiently across multiple devices. It offers a flexible and customizable interface to suit individual preferences and integrates with popular calendar services.

Zimbra Collaboration Suite is a comprehensive open source email and collaboration platform designed for businesses. It provides a secure and feature-rich environment for email, calendaring, contacts, tasks, and file sharing, supporting on-premises and cloud deployments.

2Do is a powerful and flexible task management application offering a unique approach to organizing your life. With a focus on simplicity and customization, it provides tools for everything from quick notes to complex project management.

Nylas Mail, an extensible open-source email client, offers a unified inbox, robust search, and calendar integration. It supports multiple accounts and provides features like email tracking and undo send, aiming to enhance productivity and email management for users.

Newton is a powerful, subscription-based email client designed for efficiency and productivity across multiple platforms. It offers a clean interface, unified inbox, and advanced features like read receipts, undo send, and integrations with popular productivity tools.

Kolab Community is a comprehensive, free, and open-source groupware suite designed for collaborative work. It provides integrated email, calendar, contacts, and tasks functionalities, empowering individuals and teams to communicate and manage their data efficiently and with a strong focus on data privacy.