The construction industry faces the challenge of efficiently organizing complex construction processes and exchanging data between different stakeholders throughout the entire lifecycle of a building. This paper presents an innovative concept for an integrated building lifecycle management system based on open standards and free software. The platform enables data exchange, visualization, and information processing. The creation of accessibility and user-friendliness for various project participants is promoted. A concept for linking building information in an open-source viewer is an integral part of the system. Server-side information processing to split the building data into semantic information and three-dimensional visualization data is effectively implemented. The container architecture enables scalability, web-based tools require no additional software installation, and the long-term, version-independent storage of the building data is guaranteed. Current data structure challenges require future developments, in particular the implementation of a dedicated IFC parser for bidirectional data splitting. The demonstrator offers a powerful solution for efficient and collaborative building lifecycle management and helps to drive BIM collaboration with an open-source approach.