ZDoom

I'm getting a 404 error with the link

just go to the homepage instead; it's there right in the middle of the second row from the top: https://www.humblebundle.com/

The link is malformed, it ends with "40000-space-marine/url" because of a typo, so you get to a 404 page. Remove the /url part at the end and it works.

The following games are free to download DRM-free versions of from the Humble Monthly Trove for the next couple of days:

Alan Wake's American Nightmare
Limbo
Uurnog
Fortune-499
Tiny Echo
Cat Girl Without Salad
Drawkanoid
THOR.N
Crescent Bay

GOG is currently holding a vote on what game to give away for free to celebrate their 10th anniversary. Your choices are Shadow Warrior 2, SUPERHOT and Firewatch.

Go forth and fulfil your democratic duty.

Orwell is free on Steam for the next... probably less than a day, by now.

As decided by The Democratic Process, Shadow Warrior 2 is free on GOG for the next 46 and a half hours.

Just secured my copy. I'd actually voted for one of the other games (Firewatch). Shadow Warrior looked very nice and I can totally understand why it won (I expected it to and I'm not upset that it did) but it's just another resurrected FPS with nothing particularly interesting or noteworthy about it. The other games struck me as more interesting/unusual and it would have been nice to see one of them come out on top. I suppose by their very nature, that was less likely though.

Kinsie let me just take a moment to give you props for staying on top of this thread. I was going to mention that Shadow Warrior 2 is free, but it looks like you beat me to the punch.

Boi Metro 2033 is free for next 24 hours!

https://store.steampowered.com/app/43110/Metro_2033/

Murderous Pursuits, the latest attempt at making a version of The Ship that people actually play, is free until Monday.

Limited time or not I don't know but AS OF TODAY there's a free Jill of the Jungle: All 3 Episdoes, available on a morally questionable storefront

https://www.gog.com/game/jill_of_the_ju ... te_trilogy

Destiny 2 is claimable as a gift from the battle net launcher right now for those with an account (dunno if it is given for new ones)
Lasts until nov 18

Indie horror game DISTRAINT Deluxe Edition is free to keep for a limited time to promote the impending sequel.

Here's one for the console-havers: Crackdown is currently free for Xbox 360 and Xbox One.