Microsoft’s Azure Open Source Day showcased a reference application built using cloud-native tools and services, with a focus on Microsoft’s own open source tools. This app was developed to help owners reunite their lost pets by using machine learning to quickly compare missing animal photos with images from animal shelters, rescues, and community sites. At the heart of the application is open-source machine learning, part of a library of thousands of models and data sets developed by the Hugging Face community, built on top of a wide selection of tools and services.