Anyone know a free historical database?

[unit1884]

Im looking for a database, free of course...

ex. I want to be able to look up over the past 10-20 years, what percentage of Dogs in the nba (I enter the spread) won the game by 6 points (ie -5.5)

Look at this game today:

Golden State +6.5 @ Dallas -6.5

What are the odds that GS wins this game by 6 or more? anyone know a program/website/something that can give me this kind of data?

[ManBearPig]

Accuscore gives something close to this. ESPN uses it for simulations but it's an insider option so not exactly free. Although I've never really seen accuscore being all that helpful anyways, but I'm sure it can be.

[Meestermike]

This site may help you http://b2b.sportsdatabase.com/

[xxxvince]

https://www.flipacoinandbet.com