If you've been reluctant to splash cash on Ark: Survival Evolved, then good news: it's free on Steam this weekend. The dinosaur age survival sandbox is ludicrously popular, and it's easy to see why. When Chris Livingston played he "chopped some wood, punched some birds, [and] pooped out several large, round turds," which sounds pretty great.
Other games are free too: Company of Heroes and its sequel, Company of Heroes 2, are both free for the weekend, and come with a 75% discount if you want to purchase. Mount & Blade: Warband is the fourth game to go free, with 66% taken off the usual price if you like what you play.
In case it's not obvious, these games are free for the weekend only: come Monday you'll need to pay up if you wish to continue playing.