These free exercises and worksheet apps support the CCSS.
Website: http://www.problem-attic.com/
Website: http://www.mathworksheetsland.com/
Website: http://gnowledge.com/
Website: http://www.teach-nology.com/
Free iPad app: http://itunes.apple.com/us/app/math-pro!!!/id537249122?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/math-pro!!!/id537249122?mt=8&uo=4&at=10l6SU
Website: http://www.algebrahelp.com/
Website: http://rewordify.com/