The document introduces mago3D, an open source platform that allows for the integration of BIM, AEC, and 3D GIS data on web browsers. Key features include rendering massive 3D models, seamlessly integrating indoor and outdoor spaces on a single platform, and supporting open standards like IFC. The platform uses a lightweight F4D format to optimize 3D data sizes and employs culling techniques for high performance rendering of large models. Real-world examples are presented to demonstrate mago3D's capabilities for applications like shipbuilding and volumetric data visualization.