This is the link sent by Pat D'Alfonso for the Reading and Writing Project site with numerous digital nonfiction text sets on topics at various reading levels from grades 4-12. The site includes links to high interest/popular culture articles, historical texts and science-health texts. These texts will support the Integration of Knowledge and Ideas and Research strands of the CCSS, which require students to analyze and synthesize information from multiple texts on the same topic.
GeoGebra is a free, multi-platform online tool that allows students to visualize mathematical concepts. Teachers and students search this database to view, download, revise, create and share worksheets with others. GeoGebraTube averages 100 new pieces of material every day and has had 22 million visitors since its launch 18 months ago, with some applets receiving more than 100,000 views.