GOG Connect has more games this month that can be added to your GOG account if you have them on Steam.
These are only available until December 19th apparently.
- Trine Enchanted Edition
- Shadowrun Returns
- Shadowrun: Hong Kong - Extended Edition
- Shadowrun: Dragonfall - Director’s Cut
- Oddworld: Abe’s Oddysee®
- I Have No Mouth, and I Must Scream
- Age of Wonders III
- Forgotton Anne