“Groupmatics is a white-label group ticket platform used by professional sports teams and other public event organizations to manage group sales and collect event attendee data.” This is what is says on the Groupmatics homepage, but I think if you asked their founder and CEO Matt Mastrangelo directly he would just say “We make life easier.”
http://ticketingtoday.com/groupmatics-the-world-of-group-sales-ticketing/