It seems the beta test of the OpenD6 website is just a few days to weeks away. As the developer of the software that will power the OpenD6 site wrote on the WEG Fan Forums, they will start internal testing soon and shortly after that a closed beta test will start. If you are interested to participate in this test, just sign up for the forums and send a PM to user The87.
In the meantime you can still access the following D6 books for free:
D6 Adventure (weg51011OGL.pdf)
D6 Space (weg51012OGL.pdf)
D6 Fantasy (weg51013OGL.pdf)
D6 Fantasy Creatures (weg51015OGL.pdf)
D6 Adventure Locations (weg51016OGL.pdf)
D6 Space Ships (weg51017OGL.pdf)
D6 Fantasy Locations (weg51020OGL.pdf)
D6 Magic (weg51024OGL.pdf)
They are hosted on the WEG site and are endorsed by Eric Gibson. Please note that the OpenD6 trademark license has not been released yet, so if you want to release you own OpenD6 product make sure you contact Eric first. I am not sure if it’s possible to create a game using the D6 System without using WEG’s trademarks.