Great to have that list still, now that the mix is gone.
But since it even includes a game given away to beta users, maybe it should also include Dragonsphere, which was permanently free between addition, in
May 2011, and
the end of 2015, and plenty grabbed extra keys before it became no longer free, to give away later. (But not including Warsow since that's no longer in the catalog at all so any remaining keys are rather a collector's item.)
Curious if I missed anything now, let's see...
ALIENS VERSUS PREDATOR CLASSIC 2000 - Remember that, but was for Galaxy testers, so couldn't have gotten it, and wouldn't have wanted it either.
BROKEN SWORD: DIRECTOR'S CUT - Ah, yes, I remember that one and deciding not to get it even if it was free because I was so put off by adventure games. Still dislike adventure games, and can't recall when I last tried to play one (2004-2005, briefly and quitting almost right away? or was there smth later? hmm...), but do occasionally find myself thinking I should have grabbed that, and even given it a try.
CARMAGEDDON MAX PACK - Limited keys and on reddit, so couldn't have gotten it, and wouldn't have wanted it either.
JAGGED ALLIANCE: DEADLY GAMES - For beta users, so couldn't have gotten it, and not interested either.
RISE OF THE TRIAD (2013) - Remember that, limited copies and didn't want to take it away from someone who wanted it, since I had no interest in it.
THE DARK EYE: CHAINS OF SATINAV - Huh, this I remember nothing about, and while being a reddit giveaway means I couldn't have gotten it, think I should have at least been aware it happened, and I don't think I was, oddly.
So guess only one missed was Broken Sword. Not bad.
... Hm, that source post doesn't list Full Throttle: Remastered (but you did). Wonder why.
Oh, and what about Shadow Warrior Classic Redux and Spelunky, free for XP during Winter 2016 and Summer 2016 sales, respectively, being able to get the required amount without making any purchase?