Rallly
GroupwareSelf-hosted meeting and event scheduling polls
Replaces Doodle, When2meet
Best Multi-User Groupware for self-hosting
The 26 best Multi-User groupware you can self-host, ranked by community traction.
Colanode
GroupwareCollaboration suite with real-time messaging, rich text pages, file
Radicale
GroupwareSimple, lightweight CalDAV and CardDAV server
Replaces Google Calendar, iCloud
Easy!Appointments
GroupwareOpen-source web appointment scheduler
Replaces Calendly, Acuity Scheduling
Baïkal
GroupwareLightweight CalDAV and CardDAV server with web admin
Replaces Google Calendar, iCloud
SOGo
GroupwareScalable groupware server with webmail, calendar and contacts
Replaces Microsoft Exchange, Microsoft 365
ZenTao
GroupwareOpen-source project and team collaboration platform
Replaces Jira, Confluence
Nextcloud Deck
GroupwareKanban-style project planning inside Nextcloud
Replaces Trello
Cozy
GroupwarePersonal cloud platform with contacts and calendar
Replaces Google Workspace
Nextcloud Groupware
GroupwareMail, calendar and contacts bundle for Nextcloud
Replaces Microsoft 365, Google Workspace
Twake Drive
GroupwareOpen-source collaborative file storage and workspace
Replaces Google Drive, Microsoft OneDrive
Davis
GroupwareModern admin interface for sabre/dav CalDAV server
Replaces Google Calendar, iCloud
Openmeetings
GroupwareVideo conferencing, instant messaging, whiteboard, collaborative
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
Kolab Groupware
GroupwareOpen-source groupware server with mail and calendaring
Replaces Microsoft Exchange, Zimbra
Twake Workplace
GroupwareOpen-source digital workplace and collaboration suite
Replaces Microsoft Teams, Slack
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
Cozy Contacts
GroupwareContacts management app for the Cozy personal server
Replaces Google Contacts
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 |
|---|---|---|---|---|---|
| Rallly | Under-an-hour setup | Easy | 512 MB | AGPL-3.0 | 5,303 |
| Colanode | Under-an-hour setup | Medium | 512 MB | Apache-2.0 | 5,168 |
| Radicale | Under-an-hour setup | Easy | 64 MB | GPL-3.0 | 5,110 |
| Easy!Appointments | Under-an-hour setup | Easy | 256 MB | GPL-3.0 | 4,433 |
| Baïkal | Under-an-hour setup | Easy | 128 MB | GPL-3.0 | 3,333 |
| 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 Deck | Read-the-docs project | Easy | 512 MB | AGPL-3.0 | 1,427 |
| Cozy | Under-an-hour setup | Hard | 1,024 MB | AGPL-3.0 | 1,269 |
| Nextcloud Groupware | Under-an-hour setup | Medium | 1,024 MB | AGPL-3.0 | 1,190 |
Quick picks
- Most adopted: Rallly (5,303 GitHub stars).
- Lightest footprint: Radicale (from 64 MB RAM, against 2,048 MB for the heaviest here).
- Licensing: 14 of 26 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 Multi-User within the groupware category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.