Radicale
The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
19 Alternatives To Radicale
AWS IoT
Easily and securely connect devices to the cloud.
Citadel
Is a collaboration suite (messaging and groupware).
FileAgo
Secure file storage and collaboration solution for teams
GroupDocs
GroupDocs is a web-based service for online document sharing, collaboration and management.
HRCloud2
A full-featured home-hosted Cloud Drive & Personal Assistant.
Horde
Horde Groupware is a free, enterprise ready, browser based collaboration suite.
MailEnable
MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.
Mailpile
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Omni
On-demand itemized physical storage
Opacity Storage
Private encrypted file storage, powered by crypto.
Pydio
Put your data in Orbit
Rainloop
RainLoop is a web based email client.
Roundcube
Web-based IMAP email client
SOGo
SOGo is groupware server with a focus on scalability and open standards.
Trove
Storage made simple
Zimbra
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.
eGroupWare
EGroupware is free open source groupware software intended for businesses from small to enterprises.
iRedMail
A fully fledged, free email server solution, an open source project (GPL v2).
ownCloud
ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.