This is a HEAD-only tap for OSVR (Open Source Virtual Reality). It is very much in development, and breakage should be expected!
To install, simply run:
brew tap OSVR/osvr brew install osvr-core --HEAD
To install the SteamVR-OSVR plugin, run:
brew install steamvr-osvr --HEAD
Be sure to follow the post-install instructions so that SteamVR can find the plugin.
In order for these packages to work with games such as Team Fortress 2, SteamVR-OSVR, OSVR-Core, and the dependencies need to be build as universal binaries (which can be done with the --universal flag for Homebrew). Unfortunately, due to a bug in CMake this will currently fail.