I had no idea this existed - what a great data tracker! Can be used with common core or any other standards; teachers can upload and share common assessments, and there's now an Edmodo app for seamless integration.
To my teacher followers if your school has moved to Common Core standards you will love this site. This site is filled with teacher uploaded assessments based on Common Core standards. Make sure you share what you created and follow me on there too! :)
Mastery Connect is an online resource that is focused on providing a way for teachers to visualize student progress. Teachers have access to social tools, common assessment sharing, mastery tracking, and parent reporting features for free. Easy access to the standards is also available via their Common Core App.