SOGo
SOGo offers multiple ways to access the calendaring and messaging data. CalDAV, CardDAV, GroupDAV, as well as ActiveSync, including native Outlook compatibility and Web interface.
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Citadel
Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more.
Colanode
Open-source and local-first Slack and Notion alternative that puts you in control of your data
Cozy Cloud
Personal cloud where you can manage and sync your contact, files and calendars, and manage your budget with an app store full of community contributions.
Digipad
An online self-hosted application for creating collaborative digital notepads (Documentation in french).
Digistorm
Create collaborative surveys, quizzes, brainstorms, and word clouds (documentation in French).
Digiwall
Create multimedia collaborative walls for in-person or remote work (documentation in French).