Is anyone aware of any machine learning question-answering frameworks? The only ones I'm currently aware of are Ephyra and Qanus, but they both seem like academic toys that haven't had much development and have since died. I couldn't even get Qanus to run, as it seems to have several dependencies that aren't terribly well documented.
Note, I'm not talking about OpenQA/StackOverflow-like social web QA frameworks, or proprietary black-box web services like Wolfram Alpha or True Knowledge.