Matcherino is described as 'platform for esports, tournaments and merchandise'. There are six alternatives to Matcherino, not only websites but also apps for Android, iPhone, Android Tablet and iPad. The best alternative is Challonge, which is free. Other great sites and apps similar to Matcherino are smash.gg (Free), MTGMelee (Free Personal), Community Gaming (Freemium) and Toornament (Paid).
MTGMelee is a web service to organize and participate in Magic: The Gathering tournaments. It supports the following tournament structures: Swiss, single elimination, podded, round robin, four player free-for-all, and any combination of these structures.