Who does EA think they are to require a download box for their games. They are not Steam. They will never be Steam.
Race The Sun is available freely for today on Steam. If you grab it now, you get it free permanently.
Stealth Inc 2: A Game of Clones is now available freely until August 31st, 2015 on Humble Bundle @ https://www.humblebundle.com .
Red Alert 2 (with Yuri's Revenge) is now available freely for a limited time on EA's Origin as part of the On The House promotion.

Actually used to play multiplayer on it years ago with my family (we owned discs for it).

Additional Game: It appears that Amnesia: The Dark Descent is also free on Steam (permanently, but must grab it by Wednesday @ 10AM Pacific Time).
Through Origin, Dragon Age Inquisition is free. The single player is limited to 6 hours, but multiplayer is unlimited.
Oddworld: Abe's Oddysee is now available freely (permanently) for 24 hours on Steam. Make sure to grab it while you can.
Vertiginous Golf is available freely (permanently) for 24 hours on Steam. Feel free to grab it while this promotion lasts.
Having just recently found out on a thread at GOG.com, all the legacy Earthsiege (and even Starsiege) games are now available freely at this link: http://www.tribesuniverse.com/

Tribes and Tribes 2 of course have been available freely for years now (though the 2nd game used to require a key for multiplayer, which no longer applies).

Edit: For those who are having trouble installing Earthsiege 2 on 64-bit versions of Windows, grab a 64-bit installer from this link: http://www.sierrahelp.com/Patches-Updates/ NewSierraInstallers.html#ESXP
Jade Empire Special Edition (PC Version) is now available freely for a limited time (which can be kept permanently of course) on EA's Origin as part of the On the House promotion.

If you never played Jade Empire before, I suggest to grab it. It's a great game (yes, I have actually played the original Xbox version).
Shadow Complex Remastered is available freely for a limited time on Epic Games' website.

Link: https://www.epicgames.com/shadowcomplex/

Edit: It will be available freely until December 31st, 2015.
God bless this thread.
In response to Rushnut
Rushnut wrote:
Gaben bless this thread.

Giants: Citizen Kabuto is available freely for 48 hours (less than that at present) on GOG.com.

Great opportunity to grab the game before it goes unfree. :P

Link: http://www.gog.com
Worms Forts: Under Siege is available freely four about 2-3 days on GOG.com Link is provided in the previous post.
Consortium is available freely (permanently) on Steam for the weekend.
Bionic Dues is now available freely during the Winter Sale on Humble Bundle.

Link: https://www.humblebundle.com/store/p/bionicdues_freegame
Need For Speed: Most Wanted (2012 Game) is now available freely On The House on EA's Origin for a limited time.
In response to Bandock
Bandock wrote:
Consortium is available freely (permanently) on Steam for the weekend.

It is now available freely for 1-2 days on GOG.com DRM-free, which is yours permanently if acquired within the time frame.
Jet Set Radio, Golden Axe, and "Hell Yeah! Wrath of the Dead Rabbit" are available freely on Steam. Plus, more games will be listed soon. Have found out about the Make War Not Love 3 promotion @ PCGamer.
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