https://www.indiegala.com/store
ORIGINAL SUPER KILLER HORNET GAME + BONUS CONTENT
Steam key; requires joining the IndieGala steam group.
But, free game.
3D Realms has quite a few games listed for free.
Bio Menace
Major Stryker
Monuments of Mars
Pharaoh’s Tomb
Stargunner
Arctic Adventure
All games look very retro.
Civ: Beyonf earth is free? I could have waited instead of paying $50. :smack:
Not happy with your purchase?
It was a free weekend - free access to the game for a few days, sort of an extended demo. Steam runs them regularly for various games. Not free to keep.
Oh, that’s different then 
Origins is giving away Theme Hospital for free.
And while not exactly free I think 1 cent for four games is close enough to qualify.
Scrolls
Solforge
Star Realms
Talisman and Talisman Prologue
If you choose to pay more you get more games.
Two of those games are Steam only, meaning you must pay at least $1.00. Which you should anyways, since paying only a single cent actually costs them money in transaction fees.
I was passing along what I found and I don’t know if a dollar is the minimum but what I found meantioned 1 cent for 4 games.
http://dealnews.com/Humble-Card-Game-Bundle-for-PC-from-1-cent/1260442.html#post-comment
One of the games in the first bundle, Solforge, is actually free to play which is why that is listed in that bundle.
http://dealnews.com/Steam-Weeklong-Deals-Up-to-95-off/1259659.html
This also says that there are Steam Keys for as low as 14 cents which does show up as 14 cents in the steam store.
No idea how those limited time free games work at Origin but they just added 48 free hours of Sims 4.
Word for Evil from Indiagala
https://www.indiegala.com/
This one actually looks decent!
There is a game called Theme Hospital currently available for free on Origin.
Titanfall season pass is free on origin. You need to already own Titanfall, which goes on sale sometimes for $5. It’s actually pretty fun and worth that price.
Avencast: rise of the mage free on bundle stars.
Three free weekends on steam. I don’t know why we go a month with none, and then we have 3 at the same time. Is it deliberate? It’s not as if people are required to split their time up between the 3 games if you’re worried about people beating the game in a weekend or something.
The whole X series of space strategy games, Payday 2, and Red Faction: Guerrilla.
If you want a terrible game for free, you can get the Rise of the Triad remake for such from GoG right now.
Tropico 5 and Killing Floor are free weekends on steam.
If you took part in the Elder Scrolls Online beta but didn’t buy it, you can play this weekend for free to try it out again.
Of course, the downside is that you have to play it. 
To be honest, I think that Zenimax always intended to go free-to-play. And I think launching as subscription-only was a very coldly calculating attempt to rip people off until they did so. But I suppose I’m a cynic like that.