Hi,
Sportsbook software providers are a little more pricey than casino software providers, but here are a few I can think of.
IGW – provider behind Betgameday.com, VIPSports.com, BetEuro.com (VIP Profits properties)
IQL – provides to some major networks
ASI – provider behind nine.com, betcom.com and mybookie.com (9am properties)
There are a few more out there.
Hope this helps…