Two versions of the microphone Array have been tested, the latest version is ready for production (KiCAD files in the repo).
The second version of the controller card is being assembled, we hope to test it soon (KiCAD files in the repo).
We are using an implementation of CIC filters  within the FPGA (code based on Matrix Voice HDL )
The initial software tests utilize ODAS for sound source localization 
The license for software is GNU General Public License v3.0
The license for hardware is CERN Open Hardware Licence Version 2