CopIMAP - IMAP/Maildir library for Common Lisp
In what now seems like a previous life, I wrote a IMAP library for Perl (Net::IMAP::Client). It got somewhat popular and I'm glad to see it's still being maintained — and even more glad that it isn't me who maintains it :)
Around this time last year I wanted to reply to a bunch of emails from Emacs, and had setup OfflineIMAP to download my GMail inbox to a local folder, so that I could use mu4e. While doing so, I checked to see if there's any Common Lisp IMAP client, because OfflineIMAP seemed occasionally slow. Eventually, I thought it would be nice to refresh my memory so I wrote one myself. Maildir syncing is incomplete, but it works for me, so I decided to publish it as is, and announce it here for anyone who follows my website.
More details in the README: https://github.com/mishoo/copimap.lisp