MasteryConnect is a service that offers a few products that I think teachers in U.S. public schools should know about. First, they offer a good system for tracking your students' mastery of Common Core standards. Second, they provide a great community of educators who are connecting and sharing lesson ideas. And third, MasteryConnect now offers a curriculum mapping tool that allows you to easily connect your current lessons and curriculum to Common Core and or state standards. You can see the MasteryConnect curriculum mapping tool in the video found here.
Disclosure: MasteryConnect helps feed me and my dog every month through their advertising payments.