Sirius is an alternative to Apple Siri or Google Now, though it doesn't appear to be quite as advanced. Sirius depends on Java 1.7, OpenCV, Kaldi, Protobuf, and Sphinx. There's automatic speed recognition, image matching, a question-answering system, and all of these components are able to work together to provide an end-to-end solution.
The Sirius code was initially developed at the University of Michigan and is open-source via GitHub. More details on Sirius can be found at Clarity-Lab.org.