SOGo
Groupware with calendar, address book and webmail, with sharing and permissions.
GPL-2.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 2.2k
- Deployment
- Server
- Login/SSO
- SAML, LDAP
Open-source alternatives to Google Calendar
Google Calendar in the Communication category. These are the open alternatives we recommend looking at.
Radicale
Simple server for calendars (CalDAV) and contacts (CardDAV).
GPL-3.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 5.1k
- Deployment
- Server
- Login/SSO
- LDAP
Baikal
Lightweight calendar and contacts server via CalDAV and CardDAV, with a web admin.
GPL-3.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 3.3k
- Deployment
- Server
This is guidance, not legal advice (inte juridisk rådgivning). Check with a lawyer before deciding.
Sign in for more
- Full licence analysis per use case (self-hosting, modifying, hosted service, AI use)
- Save products to your own lists
- Systemkarta: map the tools you already use (coming soon)
- Personal help and AI advice (coming soon)