Check school website for cool ones as well.
Reading
If you want to create spelling homework
http://www.kidsspell.com/
If I Were In Charge of the World Poetry Generator http://ettcweb.lr.k12.nj.us/forms/incharge.htm
A place to find rhyming words. http://www.rhymezone.com/
Graphical representation of word relationships http://www.visuwords.com/
Meriam Webster Dictionary and more online http://www.merriam-webster.com/
Learning Styles Inventory http://surfaquarium.com/MI/
Internet Research on the Brain http://faculty.washington.edu/chudler/neurok.html
Build your own house with Frank Lloyd Wright http://www.architectstudio3d.org/AS3d/index.html
Math
Site for making graphs http://nces.ed.gov/nceskids/createagraph/default.aspx
Illustrated Math Dictionary http://www.mathsisfun.com/definitions/index.html
Guess My Number Game http://www.mathsisfun.com/games/guess_number.html
Math Puzzles (word problem format) http://eklhad.net/funmath.html
More Math Puzzles http://www.puzzles.com/projects/LogicProblems.html
Logic Puzzles http://www.folj.com/puzzles/
Discovery Education Puzzles and Logic http://school.discoveryeducation.com/brainboosters/
A+ Math http://www.aplusmath.com/
The Math Lab Some fun games for students http://www.themathlab.com/toolbox/toolbox.htm
Science
Cool Science A website published by a group in Colorado Springs that has some good activities. http://coolscience.org/
Everyday Mysteries A good website for those who find themselves curious. http://www.loc.gov/rr/scitech/mysteries/
The Why Files Good explanations of questions that children might have about different science topics around them. http://whyfiles.org/
Chem 4 Kids A good site for basic information on matter, its states, and how the matter works. http://www.chem4kids.com/index.html
Science 4 Kids Superb collection of agriculture-related science sites supported by the US Department of Agriculture http://www.ars.usda.gov/is/kids/
Bizarre Stuff You Can Make In Your Kitchen The title says it all. http://bizarrelabs.com/
Ask Dr. Universe A cool science website with answers to children's questions. http://www.wsu.edu/DrUniverse/Contents.html
The Yuckiest Site on the Internet http://yucky.kids.discovery.com/
How Stuff Works A great site with explanations of how different gadgets and concepts operate. http://www.howstuffworks.com/
Social Studies Links
Constitution Day Activity - Signers of the Constitution http://www.archives.gov/education/lessons/constitution-day/signers.htmlHistory Alive Tutorial Quizzes http://www.tutorial.teachtci.com/Default.aspxMystery Class http://www.learner.org/jnorth/mclass/Famous African-Americans http://www.britannica.com/blackhistoryHandbook of Texas History Online http://www.tshaonline.org/handbook/online/Texas Beyond History A great website to find out more about our Texas history. http://www.texasbeyondhistory.net/index.htmlNational Geographic Awesome website, and a great resource for anybody. http://www.nationalgeographic.com/Google Earth Help your child understand where in the world they are. http://earth.google.com/index.htmlFact Monster A cool website with lots of almanac and "this day in history" facts. http://www.factmonster.com/Information on the 13 Colonies http://www.socialstudiesforkids.com/wwww/us/13coloniesdef.htmCharters for the Original Colonies http://www.yale.edu/lawweb/avalon/states/statech.htmInformation about the 13 Original Colonies http://www.timepage.org/spl/13colony.htmlThis Day in History http://www.history.com/this-day-in-history.doThe Bill of Rights Match Game http://www.texaslre.org/BOR/billofrights.htmlChildren of the Camps (PBS) http://www.pbs.org/childofcamp/history/index.htmlLetters from the Japanese American Internment http://www.smithsonianeducation.org/educators/lesson_plans/japanese_internment/lesson1_main.htmlLinks to Native Americans in Texas from Texas State History Online http://www.tshaonline.org/tools/teks/teks4/teks_1.htmlExplorers Links http://www.chenowith.k12.or.us/tech/subject/social/explore.htmlTimeline of US History http://shs.westport.k12.ct.us/jwb/AP/TLdocs/Timeline.htmThis is a great site for links about different eras of American History. You will need to scroll down a bit to find the links. This was put together by Georgetown ISD. http://www.georgetownisd.org/ccorner/socstudies/5th.asp