Caldav GitHub Repositories (2026) · Open Source Tools

Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.

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

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

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and about 20 MB of private memory at idle.

Self-hosted two-way Notion and CalDAV sync on Cloudflare Workers + D1 or Node.js + PostgreSQL

🗓 A modern, simple, feature-packed, fully translatable admin interface for sabre/dav based on Symfony 7 and Bootstrap

Terminal-first calendar, todo, and journal manager with iCalendar (RFC 5545) support and CalDAV sync — CLI + TUI, local SQLite storage

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

Adaptive native Nextcloud client for mobile and desktop, with dynamic support for the wider Nextcloud app ecosystem.

:white_check_mark: Tasks app for Nextcloud

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.

a calendar server aiming to be simple, fast and passwordless

A beautiful CalDAV client for the web

📆 Calendar app for Nextcloud

Calendar from Dux Labs

WebDAV (including CalDAV, CardDAV) library for the Java virtual machine (Java/Kotlin)

Tasks and calendar for GNOME, kept in your Nextcloud over CalDAV, with a GNOME Shell extension

Tatuin (Task Aggregator TUI for N providers)