We have updated the public release of Half-Life 2: Episode One. This update contains all the changes from the recent beta, thanks to the whole community for their help with testing and suggesting new features.
Changes in this update are:
Converted Half-Life 2: Episode One to the new SteamPipe content system, for optimized delivery of the game
Added support for Linux operating systems
Added support for Virtual Reality devices, in particular Oculus Rift
Numerous bug fixes contributed by community members