Guns of Icarus free on humble bundle
Link (https://www.humblebundle.com/store/guns-of-icarus-online)
Be advised: "Steam Link Required
Before you can redeem your free copy of Guns of Icarus Online, you must link your Steam account to your Humble Bundle account."
Just thought I'd point that out in case you are like me and squeamish about linking your Steam account to an outside entity.
^ That looks like something that would moisten Gus's loins appropriately.