Theta is dead. I have stopped work and I don't expect to continue on the code that currently exists. That said, I am considering other routes namely writing a .NET show control library that allows systems to be written at a lower level than the current Theta GUI, but I have no idea when or if I will start working on this.
All this is true, but if you have any interest I would be happy to allow you to have write access so you can continue the project however you see fit. All the source code is in the Sourceforge SVN repository.
Also you can check out the Source Forge project page for THETA.
Thanks goes to for hosting this project