Fans of Sid Meier's vast body of work over the years will likely be delighted that the latest Humble Bundle features a number of his most popular games. The Humble Sid Meier Bundle offers Sid Meier's Civilization III Complete, Sid Meier's Civilization IV: The Complete Edition, Sid Meier’s Ace Patrol, Sid Meier’s Ace Patrol: Pacific Skies, and Sid Meier's Railroads! for whatever price you want.
Paying more than the average price will get you Sid Meier's Civilization V and the Sid Meier's Civilization V: Gods and Kings DLC. Paying more than $15 will get you the Sid Meier's Civilization V: Brave New World DLC.
The charity of note being supported with this bundle is Action Against Hunger, a global humanitarian organization committed to ending world hunger.
As of this writing the bundle has already generated over $60,000 from the sale of over 12,000 bundles. It doesn't look like Mac or Linux are supported this time out, and all of the games are redeemable on Steam.
You can find out more about the bundle here.