Challonge - The Ultimate Source for Tournament Brackets
Spond - The easiest way to organize team sports or other type of group activities
BracketPrint - Create Round Robin, Single and Double Elimination Brackets for Tournaments print and use it for free. - Generate your bracket now.
TeamSnap - Sports Team, Club & League Management Software & Apps
Tournament Bracket Management Service - Create Single and Double Elimination tournaments with up to 512 players.
Fullcourt - The social network for basketball players