The OSVR project is now open to the public. All key software projects are now available and a few minor ones will be added in the next couple of days.
The best place to start is http://osvr.github.io/
Please also make sure to visit the Wiki, support portal, development blog and other OSVR sites available from the top right menu in http://osvr.github.io/
We look forward to working with the OSVR community to make OSVR better with every passing day.