I really like this plugin and have it installed on a couple of sites. Does exactly as described, and does it well.
Disclaimer: I'm a developer of the plugin.
BracketPress is a great way to build out your own NCAA March Madness Division 1 Men's Basketball tournament Pool.
You get your own site, your own branding and can do anything like with the system.
Again, I'm partial, but I do think it's a great plugin and ma particularly proud of the way it's turned out.
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