The physical world is being transformed by Industry 4.0 initiatives to digitize data, process, and interface. Knowledge sharing in these highly dynamic manufacturing environments, such as smart factories or smart warehouses, is crucial to help train new employees and reduce costly down-times. In this paper, the authors propose MARCRAT, a Mobile Augmented Reality based Collaborative Real-time Annotation tool, which enables on-site personnel to annotate information directly onto any smart ubiquitous devices. The user-created content is contextually relevant and will be stored and synced to other MARCRAT installed devices in real-time. A web-based editor has also been developed to help non-experts transfer device model files into augmented reality experience.