If you're a fan of DRM-free gaming service GOG, but have a large library of games locked away on Steam, you're in luck. GOG has launched GOG Connect, a program that allows users to add DRM-free versions of some previously purchased Steam games to their GOG libraries at no extra cost.

To transfer games, you have to install GOG Connect, connect your Steam account, and let the app do the rest. You'll even be given the choice of using standalone installer for your games, or downloading them via the GOG Galaxy Client.

If the service sounds too good to be true, there is one slight catch: not all games will work. Currently, just over 20 games are part of GOG Connect—including The Witness, FTL: Faster Than Light, and The Witcher: Enhanced Edition. The company promises more games will be added to the service at a later date.

Curiously, GOG says this is a "limited-time offer," with no indication of how long it will last.

Even if you're not interested GOG Connect, there's an added bonus: to celebrate the launch, GOG is taking a hefty 85 percent off a range of games, including The Witness, Saints Row the Third, System Shock 2, and more. Check out a full list of the available deals.