Project Mercury free on Steam through 4/8: https://store.steampowered.com/app/702150/Project_Mercury/

World War Z, Figment and Tormentor x Punisher all free on Epic now. Gone Home and Hob next Thursday.

Also a bunch more Steam freebies (at least at time of posting):

https://store.steampowered.com/app/282800/100_Orange_Juice/

https://store.steampowered.com/app/335190/200_Mixed_Juice/

https://store.steampowered.com/app/390710/Acceleration_of_SUGURI_2/

Yet more free Steam games. It's like they think people have more time on their hands right now or something.

https://store.steampowered.com/app/1135570/Martian_Law/

https://store.steampowered.com/app/420740/The_Deed/

https://store.steampowered.com/app/618140/Barro/

https://store.steampowered.com/app/1011300/UNI/

https://store.steampowered.com/app/588210/HELLION/

One Drop Bot free on Steam through 4/7: https://store.steampowered.com/app/1060320/One_Drop_Bot/

Rayman Legends (Standard Edition) free on uPlay for a limited time.

uPlay seems down right now, but you can get the game through this link: https://register.ubisoft.com/rayman-legends/

And ANOTHER freebie: https://store.steampowered.com/app/348510/Autobahn_Police_Simulator/

Totally Reliable Delivery Service is free on Epic Games for the next week. This is separate from their regular Thursday giveaways.

Hob, Drawful 2, and Gone Home are all free on Epic Game Store right now.

Sherlock Holmes: Crimes and Punishments will be free next week

Pinball FX3 is offering a "care package" of 3 table sets of 3 tables each: Marvel, Star Wars and Aliens. To get it, go to one of the sets being given away (link to the Aliens set is below) scroll past where you would buy it, then you should be able to add it to your account where it lists the Care Package.

Symmetry free on GOG the next 2 days.

Close to the Sun and Sherlock Holmes: Crimes and Punishments are now free on the Epic Store. Just Cause 4 and Wheels of Aurelia are free next week.

One day, I might actually have to buy something from Epic.

Ticket to Ride: First Journey (a kids version) is free on Steam. https://store.steampowered.com/app/600430/Ticket_to_Ride_First_Journey/

It's also reportedly free on iOS and Android.

Assassin's Creed II is currently free via Uplay. Might be a bit wonky though as I think they're being overwhelmed with traffic or something. I haven't been able to get it to go through properly yet.

edit: I had to activate it via the Uplay launcher for it to succeed.

PSN is currently offering the following 2 games for free, presumably even if you don't have Plus:

Uncharted: The Nathan Drake Collection: https://store.playstation.com/en-us/product/UP9000-CUSA02320_00-UNCHARTEDTRILOGY

Journey: https://store.playstation.com/en-us/product/UP9000-CUSA00694_00-JOURNEYPS4061115

Regions outside the U.S. may have other games, like I've heard Germany and China are offering Knack 2 instead of Uncharted.

...I kinda wish Knack 2 was an option for me since I have the other two. lol :D

I think both have been part of PS Plus at one point. And Knack 2 replaced Uncharted then. So I'm not sure PS Plus members anywhere are getting a new free game here unless they missed it the first time. :)

Manual Samuel free through Humble newsletter the next couple of days: https://www.humblebundle.com/store/manualsamuel-free-game

Also: Just Cause 4 and Wheels of Aurelia are free on Epic. For The King is free next week.

For The King is free on the epic games store, Amnesia: The Dark Descent and Crashlands will be free next week!

Pac-Man Championship Edition 2 is free on both PS4 and Xbox One. You may need to add it to the cart on the PSN store to see it become free.

Edit: Also free on Steam: https://store.steampowered.com/app/441380/PACMAN_CHAMPIONSHIP_EDITION_2/

I saw this advice today from Sony: Even if you have previously claimed Uncharted: The Nathan Drake Collection and Journey through PS Plus, go ahead and "buy" them again for free on the PSN store.

That way, should you ever stop being a PS Plus subscriber, you'll still have access to those games.

From April 27th through may 1st total war shogun 2 will be free on steam
https://www.totalwar.com/blog/total-war-shogun-2-giveaway-and-total-war-sale-faq/

Link to Steam's page on Total War: SHOGUN 2: https://store.steampowered.com/curator/36333614/sale/TotalWarSale

Oddly, the game says "100% off" for me, but the price is still showing $29.99, even when I add to my cart. Will have to keep checking over the next day or so.

Edit: Started working for me around 3pm Eastern on Monday.

Give it time, steam is notorious for bugging out when anything goes up live for the first couple of hours.

Evil Genius
You have to make a rebellion account then it gets linked to steam

https://id.rebellion.com/promo/evil-genius-giveaway

Ashes of the Singularity: Escalation is free over at Humble Bundle right now