Rallly
GroupwareSelf-hosted meeting and event scheduling polls
Replaces Doodle, When2meet
Best Lightweight Groupware for self-hosting
The 6 best Lightweight groupware you can self-host, ranked by community traction.
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
Davis
GroupwareModern admin interface for sabre/dav CalDAV server
Replaces Google Calendar, iCloud
Citadel
GroupwareAll-in-one groupware, mail and collaboration server
Replaces Microsoft Exchange, Microsoft 365
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 |
| 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 |
| Davis | Under-an-hour setup | Easy | 128 MB | MIT | 757 |
| Citadel | Read-the-docs project | Medium | 512 MB | GPL-3.0 | 100 |
Quick picks
- Most adopted: Rallly (5,303 GitHub stars).
- Lightest footprint: Radicale (from 64 MB RAM, against 512 MB for the heaviest here).
- Licensing: 4 of 6 use GPL-3.0; check the rest individually if you plan to modify and redistribute.
Every option here is open-source and self-hostable, tagged Lightweight within the groupware category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.