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By now, it's likely that the Monthly offerings from Humble Bundle need little to no introduction. That said, for the uninitiated, let's go over it one more time.
The Humble Monthly is a subscription service from the folks at Humble Bundle that allows people to pay $12 / £10 a month to get a stack of Steam keys, usually worth over $150 in total. Previous Monthlies have featured games like Dawn of War 3, Quake Champions, Shadow Tactics, Quantum Break and more. Each month, you'll get instant access to a couple of titles up front before getting the rest of the batch after the month finishes.
This month's instant access titles were previously announced as Civilization 6 with two DLC packs, which is already a pretty decent, but the folks at Humble haven't stopped there. As a nice little extra, Humble has added an extra early unlock title in the form of Owlboy.
If you need a little refresher on Owlboy, you can go back and read Joe Donnelly's review of the game, which earned itself a Recommended from this very site. The game is even set to release on consoles next month.
So, to recap - dropping $12 / £10 at the moment will get you Civilization 6, two DLC packs and Owlboy, along with a stack of other Steam games once the month finishes out proper.