Digital Gaming Solutions (DGS) is over in La Colmena, near Oficentro.
www.digitalgamingsolutions.com
Action Sports International (ASI), often referred to as Ticket Writer or Extensions, is in Arizona.
www.extensionsoft.com
IQ-Ludorum (IQL) is in Ontario, Canada.
www.iq-l.com
iNetSoftware (INET) (California??)
www.inetsoftware.com
Mercedes Software (Costa Rica)
www.mercedessoftware.com
As far as I know those are the only players in the sportsbook software market (Western Hemisphere) that have (or had) any significant marketshare. ASI has a very loyal customer base, most IQL customers have switched to other platforms, DGS has the fastest growing marketshare. INET has made a comeback after a scandal of cheating their clients. Mercedes AFAIK is now only used by SBG Global, their parent company.
Casino software market has many players. However, there is one that has significant marketshare in sportsbooks exclusively: the casino marketed by Digital Gaming Solutions (DGS). It offers seemless integration -- single login, single wallet -- with any of several sportsbook platforms (not only DGS, but ASI, INET, in-house systems, etc), so it is not tied to your choice of sportsbook software.