The open-source implementation (MIT license) created in conjunction with Limberger, D., Scheibel, W., Lemme, S., and Döllner, J. 2016. Dynamic 2.5D Treemaps using Declarative 3D on the Web. In Proc. ACM Web3D.
The web-based 2.5D treemaps using declarative 3D (XML3D, X3DOM, and glTF) are accessible via http://cgcostume.github.io/web3d-treemaps/, hosted via gh-pages.