Sugar is an open-source software platform originally developed for the One Laptop per Child initiative. It is used in classrooms by over 1 million children in 40+ countries. The document discusses challenges and lessons learned from implementing Sugar in classrooms. Key challenges include technical issues with devices and wireless connectivity as well as incorporating the new tools into curricula. Universities are partnering with K-12 schools to help address these challenges through classes and projects to develop educational software for Sugar.