SOGo
GroupwareScalable groupware server with webmail, calendar and contacts
Replaces Microsoft Exchange, Microsoft 365
Best LDAP Groupware for self-hosting
The 12 best LDAP groupware you can self-host, ranked by community traction.
ZenTao
GroupwareOpen-source project and team collaboration platform
Replaces Jira, Confluence
Nextcloud Groupware
GroupwareMail, calendar and contacts bundle for Nextcloud
Replaces Microsoft 365, Google Workspace
EGroupware
GroupwareWeb-based groupware and team collaboration suite
Replaces Microsoft 365, Google Workspace
Group-Office
GroupwareWeb-based groupware and CRM with email and calendar
Replaces Microsoft 365, Google Workspace
DAViCal
GroupwareServer for sharing calendars and address books via DAV
Replaces Google Calendar, Microsoft Exchange
Kontact
GroupwareIntegrated personal information manager for KDE
Replaces Microsoft Outlook
Kolab Groupware
GroupwareOpen-source groupware server with mail and calendaring
Replaces Microsoft Exchange, Zimbra
Feng Office
GroupwareWeb-based collaboration and project management suite
Replaces Basecamp, Microsoft Project
Citadel
GroupwareAll-in-one groupware, mail and collaboration server
Replaces Microsoft Exchange, Microsoft 365
Kopano Groupware Core
GroupwareOpen-source collaboration platform with Outlook support
Replaces Microsoft Exchange
Tine
GroupwareProfessional open-source groupware and CRM
Replaces Microsoft 365, Google Workspace
No apps match these filters.
At a glance
| App | Deploy effort | Difficulty | Min. RAM | License | ★ Stars |
|---|---|---|---|---|---|
| SOGo | Under-an-hour setup | Hard | 1,024 MB | GPL-2.0 | 2,173 |
| ZenTao | Under-an-hour setup | Medium | 1,024 MB | AGPL-3.0 | 1,699 |
| Nextcloud Groupware | Under-an-hour setup | Medium | 1,024 MB | AGPL-3.0 | 1,190 |
| EGroupware | Under-an-hour setup | Medium | 1,024 MB | GPL-2.0 | 298 |
| Group-Office | Under-an-hour setup | Medium | 1,024 MB | AGPL-3.0 | 282 |
| DAViCal | Under-an-hour setup | Medium | 256 MB | GPL-2.0 | 200 |
| Kontact | Read-the-docs project | Medium | 512 MB | GPL-2.0 | 200 |
| Kolab Groupware | Under-an-hour setup | Hard | 2,048 MB | AGPL-3.0 | 200 |
| Feng Office | Read-the-docs project | Medium | 512 MB | AGPL-3.0 | 108 |
| Citadel | Read-the-docs project | Medium | 512 MB | GPL-3.0 | 100 |
Quick picks
- Most adopted: SOGo (2,173 GitHub stars).
- Lightest footprint: DAViCal (from 256 MB RAM, against 2,048 MB for the heaviest here).
- Licensing: 7 of 12 use AGPL-3.0; check the rest individually if you plan to modify and redistribute.
Every option here is open-source and self-hostable, tagged LDAP within the groupware category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.