From Autodesk Labs: Project Spark

Project Spark is a technology preview of a simplified 3D building information modeling (BIM) solution. Using Project Spark, building professionals can create designs efficiently with real-world building objects, produce more reliable documentation faster, and share files with consultants using Revit or AutoCAD-based products.

Project Spark is not intended to support conceptual design, analysis, rendering, advanced collaboration, and API.

More information here.