Eager to build a game or 3D modelling tool that takes advantage of HTC's Vive and other SteamVR-friendly virtual reality headsets? It's time to get cracking. Valve has released a software development kit that lets apps use SteamVR hardware, including Valve's controller and room-scale Lighthouse tracking. On top of that, the platform now works nicely with both the Unity game engine (through a plugin) and Unreal Engine 4. It'll be a long while before you can actually run programs built on this code -- the VR devices have yet to reach many developers, let alone the public -- but this at least gets the ball rolling.