If you want to stick your Rift-kitted head into Second Life or OpenSim and have a look around, well now you can. I’ve added some basic Oculus Rift support to CtrlAltStudio Viewer 220.127.116.11244 Alpha: you can look around and move about but there is no UI. Full Rift support including UI will come when Linden Lab release their viewer with Rift support in the not too distant future. But in the meantime you can now at least enjoy the sights of your favourite virtual world locations.
Use the viewer as normal to get to where you want to go, then toggle into “Riftlook” mode (“3D” toolbar button or Ctrl-Alt-3) and don your Rift headset. Move your head to look around and use the arrow or WASD keys to move about. “Forwards” is the direction your Rift was pointing when you toggled into Riftlook. It makes most sense to use it while sitting down.
Download links and operation instructions are provided in the release notes. Please note that this is an experimental “alpha” version and as such has various rough edges and limitations. However, I’m sure you’ll enjoy it.