Kestrel

Mail and calendar, on your terms

Kestrel is a self-hosted email and calendar client. Connect your existing mail and calendar accounts — Gmail, Google Workspace, or any IMAP or CalDAV provider — and read, search, organise, and schedule from one interface, running on infrastructure its operator controls.

A unified inbox across every connected mail account, with full-text search.
Calendars, events, and scheduling polls for finding a time that works.
Tasks, filing rules, saved searches, and per-account signatures.
Optional AI-assisted sorting and search — off by default, and only as good as the provider you choose to point it at, including a fully local option.
Two-factor authentication and PGP key support for the accounts that need it.

No advertising, no analytics, and no data shared beyond what you explicitly connect.