The best Indie Bundles sites that have been operating from around 2011 are the Humble Bundle and Indie Gala sites (though the latter isn’t as good as it used to be) where you’ll sometimes find decent bundles with over 90% off the usual price of the games included in the bundles. The Humble site is in my opinion the best. A more recent addition that is worth checking out are the Fanatical bundles (that used to be called Bundle Stars) that you can find HERE.
Cave Story®’s Secret Santa is still available free over on GOG; when I first posted this over a week ago, it wasn’t actually available; you will need to revisit the page to claim the game if you tried grabbing it last week).
I have one spare Steam key for each of the following games:
Siberia 2 (Adventure game)
The Mims Beginning (Sandbox God Game)
Persian Nights: Sands of Wonders (casual HOG)
The Secret Order 5: The Buried Kingdom (casual HOG)
Tiny Tales: Heart of the Forest (casual HOG)
Settled (2D Pixel graphic horror)
Visitors (Action horror)
Pozzo Jello Crusade (casual indie puzzle)
TREBUCHET (strategy board game)
Green Game: TimeSwapper (indie action)
Which I’m offering to the first person to ask for one. Only one per community member. Please check Steam to see if the game will interest you first. I’m really busy, so may not respond until late in the day or even tomorrow. If some one has already asked, please don’t ask again as the first person will get the key. Tomorrow, (Christmas Day) I ‘may’ include several or even more titles. I have thousands of keys from Bundle Stars (now called fanatical games) and other indie bundles; but read on Fanatical that all keys sold by them are not guaranteed after a certain time, so it’s always recommended to redeem them sooner than later. I gave away a large number of Indie Gala Steam codes last year to a friend and almost all of them had been voided, even though they had never been redeemed. Many of the keys I’ve given away have been pre Summer 2017, so there’s a chance those may be invalid even though they have never been redeemed; however, so far all of the keys I have given away recently i.e. around 100 games (that to purchase when not on sale would cost over a thousand pounds) have activated on Steam. Though none were from Indie Gala.