All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.

Task manager with Todoist & Nextcloud support designed for GNOME

A simple CalDAV (calendar) and CardDAV (contact) server.

DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

📇 Synchronize calendars and contacts.

📆 Calendar app for Nextcloud

Sync Outlook with Google, SOGo, Nextcloud or any other CalDAV/CardDAV server

[Thunderbird Add-On] Central user interface to manage cloud accounts and to synchronize their contact, task and calendar information with Thunderbird

Docker image for Radicale calendar and contact server 📆 + security 🔐 + addons 🚀

A CalDAV web client similar to Google Calendar

DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at

✅ Tasks app for Nextcloud

✅ Simple, standards-based, command line todo (aka: task) manager.

Bi-directional synchronization between services such as Taskwarrior, Google Calendar, Notion, Asana, and more

A CalDAV/CardDAV server backed by Git

🗓 A simple, fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 5, initially inspired by Baïkal.

jtx Board allows you to manage your Journals (like meeting minutes), Notes and Tasks in one Android app. The app is compatible with the iCal standard (RFC5545) and is integrated with DAVx5 to allow the synchronisation of entries through CalDAV.

Todo application for those who prefer simplicity.

A Go library for WebDAV, CalDAV and CardDAV