Welcome to hyperkitty
HyperKitty is an archiver project for the mailman version 3.
It aims at implementing http://wiki.list.org/display/DEV/ModernArchiving
You can read the main documentation online.
There is a demo server available, but it's a development server, so it may be broken at the time you access it. It's usually OK though.
Designs mockup are available at: http://linuxgrrl.com/fedora-ux/Projects/Mailman/Prototype%201/
More designs are available as blog post:
The source are hosted on Github: https://github.com/hyperkitty. You'll need all three repositories.
Setting up locally for development
Discussion for hyperkitty are done on the hyperkitty-devel mailing list, or on IRC: #mailman on freenode.