Challonge - The Ultimate Source for Tournament Brackets
Toornament - Online league management platform for eSports
smash.gg - An esports platform empowering bottoms-up growth of competitive communities with value-add services...
JAATRE - JAATRE is a digital event platform that helps people discover and connect through live events.
Score7 - Score7 is a free tool that allows you to generate the tournament schedule according to the format and the number of participants that you specify.
MobaManager - E-sports management; train players, handle finances, plan strategies and review games.