Bungie's 2007 first-person shooter hit Halo 3 is now available as a free download to Xbox Live Gold subscribers as part of Microsoft's Games with Gold program. The game normally sells for $15. In the first half of the month Microsoft offered the puzzle-RPG Might & Magic: Clash of Heroes for free.
Microsoft will continue the Games with Gold program until the end of the year. It has not revealed which games will be free in the month of November yet. The company said that it may continue the free games giveaway program after Dec., but has not made a definitive decision on that yet.
You can learn more about Games with Gold here.