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Open Source Identity and Access Management.
Advanced Open Source Enterprise Wiki
Nextcloud is an open source, self-hosted file share and communication platform. Access and sync your files, contacts, calendars and communicate and collaborate across your devices.
SOGo is a fully supported and trusted groupware server with a focus on scalability and open standards.
Part of the Mailcow stack.
Mailcow is a Docker based email server which provides an elegant web interface for managing domains, mailboxes and more.