Giveaways and contests organized by Steam Unpowered and 3rd party sponsors. There are also random giveaways found online here!
SteamGifts.com is currently having a really nice giveaway with a couple of Steam gifts to win. The only catch is that you have to login through your Steam account and enter the giveaway. They also encourage you to stay on their newsletter – that’s how to make GDPR changes fun I guess. The giveaway is available below and ends in one week: