Kalypso is behind the latest Humble Weekly Sale, and is offering Trpico 3, Sine Mora, Skydrift and Anna – Extended Edition for anything above the sum of $1. If you care to fork out $6 or more, you’ll score Tropico 4 and Jagged Alliance: Back in Action too. All games are available for PC via Steam keys, and Anna – Extended Edition also available on Linux and Mac. As ever, you choose how to split the proceeds between the publisher and charitable causes. The Humble Bundle scheme has so far raised over $25 million for charity.