http://www.beaucoup.com/
"Collection of over 2,500 searchable databases and search engines, the ultimate source of free information"

http://www.martindalecenter.com/
"Maintained by James Martindale of UC-Irvine, a gateway to high-quality sources in a wide range of reference topics, especially strong in sciences and health sciences"

http://www.procon.org/
"Promoting critical thinking, education, and informed citizenship by presenting controversial issues in a straightforward, nonpartisan, primarily pro-con format."

https://resourcesforhistoryteachers.wikispaces.com/Resources
For History Teachers is an award-winning wiki byRobert Maloy of the University of Massachusetts Amherst.

http://www.bythepeople.us/
"Discover the most powerful way to connect with your legislators today. Download the free app, tell Congress how you feel on any issue, and see how your vote stacks up to theirs. By The People is non-partisan and unbiased service that brings greater transparency and accountability to our representative form of government."

http://www.xooxleanswers.com/free-newspaper-archives/other-international-newspaper-archives/
"More and more digitized archives for historical newspapers from around the world are coming online. A large number are available for free, covering a broad swath of world history, from the 1600s to modern times. Headlines, articles, display ads, broadsides, classifieds, sports scores, financials, the rise and fall of empires…all there for the taking." Provides links to newspaper archives from around the world and the site also provides free research help for quick questions.

http://littlesis.org/
LittleSis - Free Database Detailing Connections Between Powerful People and Organizations

http://www.commonlit.org/
"COMMONLIT is a [free] collection of poems, short stories, news articles, historical documents, and literature for classrooms."

http://show.mappingworlds.com/
"Explore the world by topic through this visual, interactive mapping system."

http://www.nasa.gov/audience/forkids/kidsclub/flash/#.UxEAUBj2MZ8
NASA Kids' Club Junior astronauts will have a blast exploring this fun and exciting website. There's information and games geared to a variety of ages and skill levels to help feed their love of space."

http://www.sciencebob.com/index.php
Science Bob Your go-to site for all things science and science fair. There's so much great information on Science Bob on science experiments and research methods that you almost won't need to help at all. Almost."

Common Core Practice:
newsela.com
wonderopolis.org
http://www.thinkcerca.com/