Connect your Steam account and GoG to access games you already own on Steam within GoG.
Connect your Steam account and GoG to access games you already own on Steam within GoG.
You can now link your GoG account to your Steam profile. Some titles (varies by publisher) can be copied into GoG without restrictions. This feature lets you enjoy DRM-free versions on GoG while keeping the original games available on Steam. The service will use the Steam API to retrieve information. Keep in mind the links are intended for one-time use, and you shouldn't purchase games directly on Steam—just transfer them to GoG and keep them free.
I've been expecting something similar since GOG was introduced.
Also, for those who own Witcher 1, you can find GOG versions too—though it doesn't list Witcher 2 there. https://www.gog.com/witcher/backup
Original: Pure. Awesome. Sauce!
Rephrased: It's flawless. Amazing! A delicious sauce.