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Repositories in this selection 10 · UTC 2026-11-04
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1—Sstalwartlabs / 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
2—Ppbek / QOwnNotesA plain-text note and task application with Markdown and Nextcloud integration.C++GPL-2.0 · Share derivative sourceInsufficient rank history5,939498——2026-11-02
3—Aalainm23 / planifyTask manager with Todoist, Nextcloud & CalDAV support designed for GNOMEValaGPL-3.0 · Share derivative sourceInsufficient rank history5,782350——2026-10-30
4—KKozea / RadicaleA simple CalDAV (calendar) and CardDAV (contact) server.PythonGPL-3.0 · Share derivative sourceInsufficient rank history5,177544——2026-11-02
5—Ppimutils / vdirsyncer📇 Synchronize calendars and contacts.PythonNOASSERTION · Restricted / unknownInsufficient rank history1,902186——2026-09-04
6—Fflectar / mailBuilt from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.RustAGPL-3.0 · Share derivative sourceInsufficient rank history1,739129——2026-11-02
7—Rridafkih / keeper.shCalendar aggregation and synchronization tool with an MCP interface.TypeScriptAGPL-3.0 · Share derivative sourceInsufficient rank history1,43073——2026-11-02
8—Nnextcloud / calendar📆 Calendar app for NextcloudJavaScriptAGPL-3.0 · Share derivative sourceInsufficient rank history1,196339——2026-11-02
9—Aaluxnimm / outlookcaldavsynchronizerSync Outlook with Google, SOGo, Nextcloud or any other CalDAV/CardDAV serverC#AGPL-3.0 · Share derivative sourceInsufficient rank history1,096109——2026-08-17
10—Kkurrier-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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