Crusader Kings 2 is now available freely at Steam for 48 hours. Now is a great opportunity to snatch it permanently. ;)

Link: http://store.steampowered.com/app/203770/Crusader_Kings_II/
Peggle is now available freely again on EA's On The House program for a limited time. It was initially free the first time back in June 2014 (a few months before I created this thread).

Link: https://www.origin.com/usa/en-us/store/peggle/peggle/ standard-edition
Satellite Reign is free on HumbleBundle for 2 days.

https://www.humblebundle.com/store/satellite-reign
Eador, Masters of the Broken World is available to acquire freely until Sunday. You get to keep it permanently after the fact.

Link: http://store.steampowered.com/app/232050/ Eador_Masters_of_the_Broken_World/
Yet Another Zombie Defense is now available freely until May 11th, 2018. This game can be kept permanently.

Link: https://store.steampowered.com/app/270550/ Yet_Another_Zombie_Defense/

Oddworld: Abe's Oddysee is also now available freely if you don't already own it on Steam for two days. You can also claim permanently.

Link: https://store.steampowered.com/app/15700/ Oddworld_Abes_Oddysee/
The Flame In The Flood is now available freely for two days on Humble Bundle. Claim it now and make it yours forever.

Link: https://www.humblebundle.com/store/ the-flame-in-the-flood?hmb_source=humble_home&hmb_medium=pro duct_tile&hmb_campaign=mosaic_section_1_layout_index_1_layou t_type_twos_tile_index_2
Stories: The Path of Destinies is now available freely on Steam. Currently, there is no known time limit of when it remains free. It will stay in your library after claiming it.

Link: https://store.steampowered.com/app/439190/ Stories_The_Path_of_Destinies/

Edit: Date is now confirmed to be good until May 13th. As stated above, claiming it will make it yours forever.
Galactic Civilizations II: The Ultimate Edition is available freely on Humble Bundle for 48 hours. Grab your free copy now and it remains yours forever. If you don't own the game in any form, you now have that opportunity.

Link: https://www.humblebundle.com/store/ galactic-civilizations-ii-ultimate-edition?hmb_source=humble _home&hmb_medium=product_tile&hmb_campaign=mosaic_section_1_ layout_index_1_layout_type_twos_tile_index_2
Prismata is now available freely on Steam until May 21st. This is one of those you can keep forever as well. This is a rare occasion that we get an early access game that is free for a limited time.

Link: https://store.steampowered.com/app/490220/Prismata/
Unreal Gold is now available freely on GOG.com for 48 hours. This is a great opportunity to claim and make it yours now if you don't own it already. ;)

Link: https://www.gog.com/game/unreal_gold
Hacknet - Deluxe Edition is now available freely right now on Humble Bundle for 48 hours. If you're into games involving hacking, then this might be your alley.

Link: https://www.humblebundle.com/store/ hacknet-deluxe?hmb_source=humble_home&hmb_medium=product_til e&hmb_campaign=mosaic_section_1_layout_index_1_layout_type_t hrees_tile_index_2
Guns of Icarus Alliance is now available freely for about 4 days. Claim it while you can.

Link: https://store.steampowered.com/app/608800/
Xenonauts is available freely on GOG.com for 48 hours. This looks like a great opportunity to be watching out for extraterrestrials.

Link: https://www.gog.com/game/xenonauts (Should be claimable on the front page)
Fortified is now available freely on Steam until June 8th. This is another game that can be claimed to make it yours forever.

Link: https://store.steampowered.com/app/334210/Fortified/
Totally Accurate Battlegrounds is free until June 9th at 4am (assuming it released at 12am on June 5th.)

https://store.steampowered.com/app/823130/ Totally_Accurate_Battlegrounds/
Quake Champions can now be claimed until June 18th. This game will eventually be free-to-play anyhow, but this is a great time to get in early.

This game can be enjoyed without paying for anything.

Link: https://store.steampowered.com/app/611500/Quake_Champions/
Ziggurat is now available freely for 48 hours on GOG.com. Now is great opportunity to claim this game.

Link: https://www.gog.com/game/ziggurat
Layers of Fear is available freely for a limited time (?) (but this time on Steam itself). Grab it while you can so it stays in your library forever.

Link: https://store.steampowered.com/app/391720/Layers_of_Fear/
Swords and Soldiers HD is now available freely for a limited time on Steam. Grab it now to keep the game forever.

Link: https://store.steampowered.com/app/63500/ Swords_and_Soldiers_HD/
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