GOG.com revealed today GOG Galaxy, a completely optional program that allows players to hop into multiplayer games without the need to be connected to the Internet when playing single player.

During the CD PROJEKT RED and GOG.com Summer Conference, GOG.com ushered in a new era of DRM-free gaming with the announcement of GOG Galaxy, its brand new technology that places unparalleled freedom over online play and connectivity back in the hands of gamers. With this an entirely optional platform, players can dive into online multiplayer portions of their favorite games, while enjoying single-player anytime they please without needing an internet connection. GOG Galaxy is designed to be a platform-agnostic online solution, allowing GOG.com and Steam players -- with more platforms to be added in the future -- to game together. An optional client will be introduced later this year to allow for easy game updating, and GOG.com has already begun working with developers to implement the technology in their games.

There isn't much more to go on right now, but you can get started at the GOG Galaxy landing page. On there you will see the above trailer again and have a chance to sign up for a closed multiplayer beta for The Witcher Adventure Game.