All mutt-kz has been merged to the NeoMutt project.
NeoMutt is actively maintained and synced with the original mutt upstream and with many out-of-tree patches. It's recommended solution for end-users.
Fedora and CentOS packages are available in copr repositories.
This is not another curses front-end for notmuch, this is mutt
I have forked mutt to seriously integrate notmuch to this excellent e-mail client. I don't want to use symlinks or any other hacks to emulate virtual folders. My wish is mutt linked with libnotmuch. [kzak Jan-2012]
Now mutt-kz contains many other improvements like sidebar patch, index-color patch and more.
Don't forget to use –enable-notmuch to enable notmuch support, see README.notmuch for more details.