I follow We Are Teachers on Facebook (highly recommend it). They sent a link to many other websites that can be used in a classroom. Click here to get the list of websites. My favorite websites include
1. Pinterest - I love this site! I don't think that I have an original idea anymore. Why rack my brain when I could just go there for new ideas.
2. Teachers Pay Teachers - Great spot to get ready made resources.
3. Common Core Sheets - Free resources aligned to common core.
4. FCRR - Centers that can be printed and ready to go.
5. Free Rice - Choose the subject, answer questions, and rice gets donated to needy areas for each correct answer.