The newest Humble Bundle is available and focuses on the work of Paradox Interactive. The pay what you want tier is absolutely massive. Any price you want to pay gets you War of the Roses: Kingmaker, Magicka and a par of item packs, Knights of Pen and Paper +1 Edition, Victoria II, and a Helping Heart icon on the Paradox forums.
Beating the average of about $5 gets you Hearts of Iron II, Impire, Crusader Kings II and its Sons of Abraham DLC alongside the Paradox Interactive Music Hits album. Paying $15 or more gets you all of this and Europa Universalis IV and its Conquest of Paradise DLC. If you’re into these games, then this is a must-have bundle to fill in any gaps in your collection.