Bentley Systems acquires Cesium, the leader in 3D Geospatial
businesswire.com
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For e.g., they allow embedding 3D world maps and places in Javascript / webpages https://cesium.com/platform/cesiumjs/
They allow integration into Unreal Engine https://cesium.com/platform/cesium-for-unreal/
If this were AutoCAD, RIP
Cesium is for building Web delivered interactive digital twins that include traditional spatial datasets. BIM is optional. The data within is not of CAD quality upon render in almost all instances.
Additionally, Cesium is not designed to be a CAD editor.