If you have any change in your pockets after the rigours of the Steam Sale, consider lashing out on this excellent bundle from Paradox.
Pay what you want for March of the Eagles, Darkest Hour: A Hearts of Iron Game and Sword of the Stars 2: Enhanced Edition, as well as two copies of War of the Roses: Kingmaker.
Cough up more than the average ($2.42 at time of writing) to receive Cities in Motion 2 and Warlock: Master of the Arcane as well.
If you pay out more than $16 you'll also receive Crusader Kings 2 and the Russian and Norse Unit DLC packs.
Most of these are only available for PC, with a few exceptions on Linux and Mac, and all are redeemed through Steam rather than DRM free options.
As usual, you decide who gets your money - publisher, charity or organisers. Paradox has nominated charity:water as its beneficiary.