A dozen custom PC builders and manufacturers including Alienware and Origin PC are among the latest hardware partners announced to make third-party Steam Machines, Valve's gaming platform designed for playing games in the living room.

Engadget reports from CES 2014 that Alienware, Falcon Northwest, CyberPowerPC, Origin PC, Gigabyte, Materiel.net, Webhallen, Alternate, Next, Zotac and Scan Computers are some of the first vendors confirmed to support Valve's Steam Machine project. Digital Storm is also on-board as a Steam Machine hardware partner.

Custom gaming PC builder iBuyPower unveiled its version of the Steam Machine in November. The company has two versions of its SteamOS-operated machine, codenamed "Gordon" and "Freeman," which will go on sale this year from $499. Many other notable custom PC makers are yet to sign up to Valve's new platform, such as Razer, Velocity Micro, AVAdirect, Maingear and Puget Systems.

Pegged with an expected 2014 launch window, Valve announced its Linux-based operating system, SteamOS, Steam Machines and the touchpad-based haptic Steam Controller in September. Valve made the SteamOS, available for download last month, rolling it out alongside the launch of the Steam Machine hardware beta. Steam Machine prototypes were sent to 300 testers last month as part of the beta.

CES 2014 is underway in Las Vegas where Polygon is reporting live to bring you the latest news.