GoG.com's latest addition to its library of DRM-free PC game titles is one that serves as a sequel to a game previously posted on the site. It's UFO: Aftershock, the sci-fi turn-based strategy sequel to developer Altar Interactive's previous game in the series, UFO: Aftermath. Both games are heavily inspired by the classic X-Com series.

GOG.com's version of UFO: Aftershock comes with some free wallpapers, artwork and even a free comic book based on the game. You can purchase and download the 2005 released title for just $9.99. GoG.com's web site shows that the next game that will be posted on the site will be the Myst sequel Riven.