Free Campaign DLC for Grey Goo

Grey Goo is an RTS game about, well, goo. Based on Eric Drexler's doomsday scenario of the same name, it is a tale of warfare against rogue nanobots. It was released in January of 2015, but since then developer Petroglyph have been hard at work creating new content for it. That content is soon to be available absolutely free to all players. 

The Descent of the Shroud DLC is a free download that gives additional campaign content and a new faction to the game. In addition, the game has been relaunched on Steam as Grey Goo Definitive Edition. This re-released and price-reduced pack includes the original game, the previously released DLC campaign, Emergence, the Descent of the Shroud DLC, and a downloadable soundtrack.