GeoGebra is dynamic mathematics software for all levels of education that brings together geometry, algebra, spreadsheets, graphing, statistics and calculus in one easy-to-use package.
I'm sorry - the last link was incorrect. This one, http://www.edmodo.com/home#/join/fbf4a351d05fbd44de06721578b76895 is the correct link to CCSS - Math Resources and PLC. Discussion, sharing, resources - mostly grades Math 6 - Algebra. Join the conversation as we implement the common core.
This seems like a great website to help us unpack the standards for Algebra. Every standard is listed with sample activities that students can do to show proficiency in each standard.