LdShake is a tool that allows teachers to collaboratively create, share, and edit learning design solutions. It combines a repository, social networking, and authoring capabilities. Teachers can work together in teams to design problem-based learning activities. The tool is being used by a group of biology and medicine teachers at Universitat Pompeu Fabra in Barcelona who need to collaborate on course designs integrating multiple disciplines. An evaluation of the tool found it intuitive to use for collaborative design. Future work will focus on usability improvements and integrating existing learning design templates.