Challonge - The Ultimate Source for Tournament Brackets
Lightbeam for Firefox - Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
BracketPrint - Create Round Robin, Single and Double Elimination Brackets for Tournaments print and use it for free. - Generate your bracket now.
island - a free and opensource alternative to parellel space
Toornament - Online league management platform for eSports
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.