Teachers TryScience is a web site for teachers. This site provides free and engaging lessons, along with teaching strategies and resources, which are designed to spark students' interest in science, technology, engineering and math (STEM). What's more, the site features collaboration tools to enable teachers to discuss and share effective instructional practices.
Just type in a word and watch an entire word association tree pop up on screen. It includes definitions, synonyms, and related words. Each part of the tree can be clicked on to see even more expanded meanings behind those terms as well.
Use this site to create online voice recordings. This is a perfect way to get content from your students without them having to always write information down. They can talk, sing, or even par their comprehension of the content and save their file and send it to you to grade later.