flectar / mail

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.

stalwartlabs / stalwart

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

lennart-k / rustical

a calendar server aiming to be simple, fast and passwordless

x3me / omacal

Native calendar for Google Calendar, iCloud and any CalDAV server. Born on Omarchy Linux, runs on any Linux and on macOS, with a CLI your agent can use. Tauri, Rust, Svelte.