The first beta version of CopperCube
is now available for download at ambiera.com. CopperCube is a 3D engine for Flash, but can also create standalone hardware accelerated windows .exe files if wished.
There are not many features yet, but you can create 3D scenes for flash and windows already, and script them using ActionScript or Squirrel, so basically, there is not much you can't do with it.
Also, if you know irrEdit, you'll notice that the 3D editor of CopperCube is based on it, but I redesigned a lot of its user interface, like the 3D tools and the material editing tab. Looking forward for feedback and (hopefully not that much) bug reports. :)