Since the adoption of the Common Core State Standards (CCSS), many resources have been developed to support its implementation. Below is a list of diverse resources targeting the CCSS, especially those relevant for the Standards for Mathematical Practice. These resources may support a range of activities including curriculum adoption, assessment, classroom observations, etc.

From the Common Core authors

Progressions Documents for the Common Core Math Standards
These narrative documents describe how topics in the Common Core progress throughout the grade levels. Very helpful for vertical alignment!

Illustrative Mathematics
An extensive free library of tasks tagged by individual content standards. Stay tuned; the site is growing to offer different resources.

Achieve the Core
Multiple free classroom and planning resources to support Common Core implementation including coaching tool, planning tool, classroom video, tasks, lesson plans, and assessments. Worth exploring!

Tools for the Common Core Standards
A blog by Bill McCallum, one of the lead authors of the CCSSM. Great place to get updates and insights from an author.

From Other Sources

Mathematics Assessment Project
Library of mathematics tasks and lessons aligned to the content and practice standards. PD modules also available around instruction and assessment.

Inside Mathematics
Classroom videos of students engaged in the SMP. Additional resources for coaches, administrators, as well as performance tasks also available.

The CCSS Curriculum Materials Analysis Tools
Tool to assess the alignment of curriculum materials with the CCSSM. Supporting PD for using the tool is also available.

The 5x8 Card
Observation tool for principals which focuses on student actions that are indicators of mathematical practice.

Math Common Core Coalition
Umbrella of professional organizations that provides a central location for Common Core resources.