I got an email from GoG earlier with the message so I already claimed Torchlight, but thanks for the heads up, regardless. It's really awesome of GoG to give away free games like this. I'll probably pick up a few games from the sale, even though my backlog is too big already.
Also, unrelated to this sale, but still worth mentioning, but there's also a new Humble Bundle for Android going on right now: https://www.humblebundle.com/ .