webmail

JMAP Webmail built for the 21st Century. A modern, self-hosted email client for Stalwart Mail Server powered by the JMAP protocol. Email, calendar, contacts and files. Fast, private, and open source. Maintained by bulwarkmail on GitHub, where it has earned 791 stars from the community.

It's actively developed around calendar, contacts, email, and is a solid reference for anyone building with these tools.