CalendarServer Alternatives & Competitors

Cal and CardDAV server.

Key Baïkal features:

Open Source CalDAV and CardDAV Support Lightweight Self-hosted

Open Source

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

Key Radicale features:

Simple Installation Compatibility Customization Minimal Dependencies

Open Source

Do-It-Yourself Data Analytics & Business Intelligence, Powered by AI.

Key Grapple features:

Automatic Data Refresh Universal Data Library Natural Language Map Data

Visit website freemium $99.0 / Monthly (Per Editor, Unlimited Viewers)

DAViCal is a server for calendar sharing.

Key DAViCal features:

Open Source Support for CalDAV and CardDAV Cross-Platform Compatibility Community Support

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

Key SOGo features:

Open Source Multi-Platform Support Integration Web Interface

Open Source

Lightweight CalDAV/CardDAV server on top of Git.

Key Xandikos features:

Simplicity No Database Dependency Open Source Lightweight

Open Source

AgenDAV is an Open Source CalDAV Web application.

Key AgenDAV features:

Open Source Web Interface for CalDAV Customization No Vendor Lock-in

Calypso is a file sharing client using the anonymous network MUTE. Developped using C++ and Qt. For windows and linux, portable to other environments.

Key Calypso features:

Open Source Active Community Support Customization and Flexibility

Web-based IMAP email client.

Key Roundcube features:

Open Source User-Friendly Interface Extensibility Security

Open Source

Give your email deliverability a huge boost and say goodbye to spam. Warm up any email address with lemwarm automagically.

Key Lemwarm by Lemlist features:

Automated Warm-up Domain Reputation Time-saving Analytics

An open source mailserver suite.

Key mailcow features:

Comprehensive Feature Set Open Source Docker-based Deployment Active Community and Support

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. .

Key MailReach.co features:

Deliverability Improving Email Warming Meaningful Warming Content Smart Warming Algorithm

Visit website paid $19.5 / Monthly (Pro)

Airmail is a lightweight and lightning fast mail client for Mac.

Key Airmail features:

Customizable Interface Integration with Other Apps Unified Inbox Advanced Filtering and Search

Mailu is a simple yet full-featured mail server as a set of Docker images.

Key Mailu features:

Open Source Lightweight Modularity Docker-based Deployment