mago3D(http://mago3d.com), a web based GeoBIM platform developed by Gaia3D, has been listed as a showcase of CesiumJS at their demo page. https://cesiumjs.org/demos/mago3D/
Also mago3D team will show a live demonstration of mago3D at Cesium booth at FOSS4G NA on 3:30pm 16th, May.
Expect your interests and attendings.
Thanks and regards,