Does GOG give away free games?

I'm curious, does GOG, the popular digital distribution platform for video games, actually offer any free games to their users? I've heard some rumors that they do, but I'm not entirely sure if that's the case. Is there any truth to the idea that GOG occasionally gives away free games to their community? And if so, how does one go about getting their hands on these freebies? I'd love to know more about this, as it could be a great way for gamers to save some money and try out new titles without any financial risk.