SOGo
GroupwareScalable groupware server with webmail, calendar and contacts
Replaces Microsoft Exchange, Microsoft 365
Best Cross-Platform Groupware for self-hosting
The 7 best Cross-Platform groupware you can self-host, ranked by community traction.
Nextcloud Groupware
GroupwareMail, calendar and contacts bundle for Nextcloud
Replaces Microsoft 365, Google Workspace
Openmeetings
GroupwareVideo conferencing, instant messaging, whiteboard, collaborative
Kontact
GroupwareIntegrated personal information manager for KDE
Replaces Microsoft Outlook
Digiwall
GroupwareCreate multimedia collaborative walls for in-person or remote work
Cozy Cloud
GroupwarePersonal cloud where you can manage and sync your files, notes,
Zimbra Collaboration
GroupwareEmail, calendar, collaboration server with Web interface and lots
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 |
| Nextcloud Groupware | Under-an-hour setup | Medium | 1,024 MB | AGPL-3.0 | 1,190 |
| Openmeetings | Read-the-docs project | Medium | 512 MB | Apache-2.0 | 688 |
| Kontact | Read-the-docs project | Medium | 512 MB | GPL-2.0 | 200 |
| Digiwall | Read-the-docs project | Medium | 512 MB | AGPL-3.0 | — |
| Cozy Cloud | Read-the-docs project | Medium | 512 MB | GPL-3.0 | — |
| Zimbra Collaboration | Read-the-docs project | Medium | 512 MB | GPL-2.0 | — |
Quick picks
- Most adopted: SOGo (2,173 GitHub stars).
- Lightest footprint: Openmeetings (from 512 MB RAM, against 1,024 MB for the heaviest here).
- Licensing: 3 of 7 use GPL-2.0; check the rest individually if you plan to modify and redistribute.
Every option here is open-source and self-hostable, tagged Cross-Platform within the groupware category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.