iBuyPower, Digital Storm, and Piixl have all announced their Steam Machines — computers which run Valve's SteamOS game platform — and tomorrow Valve is holding a press conference to announce many more. How many? Engadget has a list of 12 companies that it claims are all among Valve's official Steam Machine hardware partners. According to the publication, usual suspects like Alienware, Falcon Northwest, and Origin PC are all on the list, as well as Gigabyte, CyberPowerPC, Zotac, Next, Webhallen, Alternate, Materiel.net, and Scan Computers. While some of those names are boutique PC builders, others are electronics retailers.

Engadget writes that the list may not be complete and other third-party companies may announce their own Steam Machines as well. Last we heard, Valve expected Steam Machines to ship in the second half of 2014. Presently, the company is trialling the concept with 300 beta testers, each of whom received an official prototype box built by Valve itself. The Linux-based SteamOS operating system is also currently in beta, and is free for anyone to download.