Word Hippo

Word Hippo is a online dictionary, thesaurus, and translator.  You can find synonyms, antonyms, etc. 

Snapify

Snapify is a free Google Chrome extension that allows you to highlight a word, phrase, or image marker on any webpage, then by clicking it or "Snapping it", Snapify will then open up its search box with results from Google, Twitter, Wikipedia, etc.  What makes this unique, is that you can visit other websites and pages without opening new tabs or leaving the current page you are browsing.
The search results appear in a window in the same tab.  You can also open external links on a given page within its box.
By following the link, and downloading the extension on your CHROME browser, you will easily be able to use this handy tool on any webpage you visit while browsing in Chrome.

Kiedos.com

 Kideos is a free site that is filled with online safe, kid friendly videos. They are organized by age groups (such as 0-2, 3-4, etc.) and abide by COPPA compliance.