Lillian Coletta and Leah Green, two pre-service teachers at UVM, have created an amazingly comprehensive Google site for middle-level math educators: https://sites.google.com/site/8thgradeccssresources/
Each resource corresponds to an 8th grade Common Core standard, and they’d love feedback on their site, especially from any teachers who incorporate some of the resources into their classroom.
A big thank-you to the two of them for being so willing to share their work!