The classic Harlan Ellison point-n-click I Have No Mouth And I Must Scream is free on GOG for the next 48 hours.
(claim from the banner on their front page)
– Account required: GOG.com with e-mail marketing opt-in
– DRM-Free (NOT Steam)
– Offer ends December 25, 1400 GMT
– Steam Store for comparison.
Don’t forget, there will be two more GOG winter sale freebies on the 27th and 3rd.
Enjoy the game.