The 3D Tune-In project finished in 2018. Several partners though have kept working together developing further some of the software tools (updates can be found in the 3D Tune-In Toolkit Github account - https://github.com/3DTune-In/ ) and starting new research projects on similar topics (e.g. www.sonicom.eu)
I notice you're asking for an essay on — which likely refers to the practice ( Upasana ) of the Goddess Kali, and perhaps the availability or content of PDF documents related to this tantric or devotional tradition.