
Challonge
7.3#1 in game tournament softwareFrom $14.99 a yearFree planWebAPI
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Challonge suits casual or professional organizers of esports and traditional sports competitions. It may also fit communities or applications that need tournament pages, event registration, or API-based score reporting.
Open Tournament suits people seeking a bracket-management project or developers interested in contributing to its community-led game effort. Contributors should be prepared to use Git and Unreal Engine.