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Best LDAP Groupware for self-hosting

The 13 best LDAP groupware you can self-host, ranked by community traction.

SOGo

Scalable groupware server with webmail, calendar and contacts

Replaces Microsoft Exchange, Microsoft 365

★ 2.1k Hard setup GPL-2.0

ZenTao

Open-source project and team collaboration platform

Replaces Jira, Confluence

★ 1.7k Medium setup AGPL-3.0

Nextcloud Groupware

Mail, calendar and contacts bundle for Nextcloud

Replaces Microsoft 365, Google Workspace

★ 1.2k Medium setup AGPL-3.0

EGroupware

Web-based groupware and team collaboration suite

Replaces Microsoft 365, Google Workspace

★ 295 Medium setup GPL-2.0

Group-Office

Web-based groupware and CRM with email and calendar

Replaces Microsoft 365, Google Workspace

★ 275 Medium setup AGPL-3.0

Horde Groupware

PHP groupware suite with webmail and calendaring

Replaces Microsoft Exchange

★ 243 Hard setup GPL-2.0

DAViCal

Server for sharing calendars and address books via DAV

Replaces Google Calendar, Microsoft Exchange

★ 200 Medium setup GPL-2.0

Kontact

Integrated personal information manager for KDE

Replaces Microsoft Outlook

★ 200 Medium setup GPL-2.0

Kolab Groupware

Open-source groupware server with mail and calendaring

Replaces Microsoft Exchange, Zimbra

★ 200 Hard setup AGPL-3.0

Feng Office

Web-based collaboration and project management suite

Replaces Basecamp, Microsoft Project

★ 106 Medium setup AGPL-3.0

Citadel

All-in-one groupware, mail and collaboration server

Replaces Microsoft Exchange, Microsoft 365

★ 100 Medium setup GPL-3.0

Kopano Groupware Core

Open-source collaboration platform with Outlook support

Replaces Microsoft Exchange

★ 60 Hard setup AGPL-3.0

Tine

Professional open-source groupware and CRM

Replaces Microsoft 365, Google Workspace

★ 21 Medium setup AGPL-3.0

Every option here is open-source and self-hostable, tagged LDAP within the groupware category. Compare them on the individual app pages for setup difficulty and resource requirements.