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1stalwartlabs / stalwartAll-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).RustUnknown · Restricted / unknownInsufficient rank history15,6761,036——2026-11-02

2Kozea / RadicaleA simple CalDAV (calendar) and CardDAV (contact) server.PythonGPL-3.0 · Share derivative sourceInsufficient rank history5,177544——2026-11-02

3pimutils / vdirsyncer📇 Synchronize calendars and contacts.PythonNOASSERTION · Restricted / unknownInsufficient rank history1,902186——2026-09-04

4aluxnimm / outlookcaldavsynchronizerSync Outlook with Google, SOGo, Nextcloud or any other CalDAV/CardDAV serverC#AGPL-3.0 · Share derivative sourceInsufficient rank history1,096109——2026-08-17

5kurrier-org / kurrierKurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.TypeScriptNOASSERTION · Restricted / unknownInsufficient rank history1,06774——2026-11-01

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