If you haven't already, be sure to sign up for the Developer Newsletter, to learn when there are important changes that may affect you.
This plugin can be used to access the FOVE eye tracker and HMD headsets. To use it, download a version matching your core or server version and bits, and unzip it, making sure the making sure the
.DLL ends up in the plugin directory near
osvr_server.exe, usually called
osvr-plugins-0. You'll need to use a configuration file similar to the sample included in this archive, instead of the default configuration.