Welcome to Ubuntu MATE download page!
Ubuntu MATE is based on Ubuntu 12.04 and MATE 1.6.
There is only the i686 version done yet, so if you need the 64bit / x86_64 please wait because I'm working on it ;)
And this is the first release.
Special thanks to:
MATE, Ubuntu, GNOME, LibreOffice, GIMP, VLC, Debian, Exaile, Linux Mint, Firefox, Thunderbird developers. And all the developers of software included on Ubuntu MATE.
WebUpd8 team :)
Ambiance Crunchy theme developer: http://gnome-look.org/content/show.php?action=content&content=151180
And thanks to all developers that did the hard and great work included on Ubuntu MATE.