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/
Shadowrun Returns Deluxe is now available freely for 48 hours on Humble Bundle. Grab it while you can and make it yours forever. ;)

Link: https://www.humblebundle.com/store/ shadowrun-returns-deluxe?hmb_source=humble_home&hmb_medium=p roduct_tile&hmb_campaign=mosaic_section_1_layout_index_1_lay out_type_twos_tile_index_1
Hacknet (non-Deluxe) is now available freely until July 14th (which was started yesterday). Grab it if you missed it the first time on Humble Bundle.

Link: https://store.steampowered.com/app/365450/Hacknet/
The first episode of Odysseus Kosmos and his Robot Quest is now available freely for a limited time. Claim it now and you keep it forever.

Link: https://store.steampowered.com/app/769920/ Odysseus_Kosmos_and_his_Robot_Quest_Episode_1/
Here's a blast from the past! Card Sagas Wars is a cross-over beat-up game that a huge chunk of the 2000-2010 internet was waiting for. Well, turns out they've released a prototype, or a demo right now. Dunno if this belongs in this thread, if it doesn't delete.

In response to Maximus_Alex2003
That's perfectly fine. Doesn't hurt to put out free prototypes. ;)
If you missed the first freebie of Guns of Icarus Alliance a while back, you now have another chance of getting it for two more days from Humble Bundle instead.

Link: https://www.humblebundle.com/store/ guns-of-icarus-alliance?hmb_source=humble_home&hmb_medium=pr oduct_tile&hmb_campaign=mosaic_section_1_layout_index_1_layo ut_type_twos_tile_index_1
This is not a free game notification, but rather news that EA is no longer doing the On The House program. Source of these news are provided below. This means there will no longer be anything Origin related for a long while.

Link: https://www.pcgamer.com/ origins-free-game-program-on-the-house-has-been-retired/?utm _content=buffer61b8d&utm_medium=social&utm_source=twitter&ut m_campaign=buffer-pcgamertw
I have now just become aware that Star Ruler 2 (with the exception of it's music) has been made free (including art assets) and open sourced since July 22nd. The only catch is you will need to build it yourself. Fortunately, instructions are provided on the GitHub repository. DLC is even included inside the code. If you're feeling generous or/and want music, you can still buy the game at GOG.com or Steam.

Link: https://github.com/BlindMindStudios/StarRuler2-Source

P.S.: This is actually a very rare exception as I have never posted a game that not only went open source, but also free (with the exception again, music)

Insurgency free on Steam for 48 hours, once redeemed it's yours to keep.
BROKE PROTOCOL is available freely for 100 hours (since August 15th) on Steam. Claim it now and it's yours forever.

Link: https://store.steampowered.com/app/696370/ BROKE_PROTOCOL_Online_City_RPG/
Just got word that FOR HONOR Starter Edition is now available freely for a limited time and can be claimed permanently.

Link: https://store.steampowered.com/app/304390/FOR_HONOR/
The Tiny Bang Story is available freely for a very limited time (until September 25th, 2018 at 10am Pacific TIme). If you want to claim it forever, get it fast.

Link: https://store.steampowered.com/app/96000/The_Tiny_Bang_Story/
Just for a heads up, there is a vote going on GOG.com to decide which game becomes part of a giveaway (which will probably last for 48 hours or any allotted time). This is done to celebrate it's 10 year anniversary.

Go ahead and make a vote. Whoever wins, either I or anyone can provide the update that provides the game for free.

Link: https://www.gog.com/10years
Recently got word of a free game that is available for a limited time (which is currently unknown). That title is Hyperdrive Massacre!

Link: https://store.steampowered.com/app/402390/ Hyperdrive_Massacre/

Also, keep an eye out for another free title (which will likely be 48 hours) on GOG.com today.
Shadow Warrior 2 is now available freely for 48 hours on GOG.com as part of their 10 year anniversary giveaway! Grab it while you can!

Link: https://www.gog.com/ (From the front page)
Metro 2033 is now available freely for 24 hours on Steam. Claim it and keep it in your library forever. Great if you missed the opportunity back in November 2014 (before this thread was created).

Link: https://store.steampowered.com/app/43110/Metro_2033/
Murderous Pursuits is now available freely until October 29th on Steam. Grab it now and forever shall be yours.

Link: https://store.steampowered.com/app/638070/Murderous_Pursuits/
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