GOG's 'Connect' service, offering free GOG copies of certain games if you already own them on Steam, was updated yesterday with a refreshed list of 20 qualifying games. It's not currently clear how long these will remain available, so don't delay too long if you're interested!
The currently available games are as follows:
Broken Sword 2: Remastered
Broken Sword: Director's Cut
Risk of Rain
The Witcher - Enhanced Edition
The Witcher 2: Assassins of Kings - Enhanced Edition
Alien Shooter + Expansions
Metro 2033 Redux
Moto Racer 2
Moto Racer 3 Gold Edition
Sins of a Solar Empire: Rebellion - Ultimate Edition
The Witcher Adventure Game
Worms World Party Remastered
HOW DOES GOG CONNECT WORK?
To connect your library with GOG.com, sign in to your active Steam account via this page. NOTE: Make sure your Steam Privacy Settings & Profile Status are set to public.
You'll be able to permanently import all the games listed below to your GOG.com library – assuming you own them. The eligible games are limited-time offers made possible by participating developers and publishers, so stay tuned for more games to come.
You can connect only one Steam account with your GOG.com library. This process is permanent – choose wisely!