We have updated the public release of Half-Life: Opposing Force. 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: Opposing Force to the new SteamPipe content system, for optimized delivery of the game
Added support for Mac OS X and Linux operating systems
Enabled Cloud support for save games
Improved OpenGL rendering pipeline and output to leverage the capabilities in todays GPU