Homeschool Helper Freebies

There has been much discussion about where to find free things to help us along our homeschool journey, so I thought I would put as many free places I know of to find help or curriculum or just interesting things. 

Kahn Academy www.khanacademy.org  They show videos to help learn concepts

Rays Arithmetic, you can sometimes find these books for free in the library, but if you cannot, they are free online
Rays New Primary
http://books.google.com/books?id=ntTy0NUjKHQC&dq=free+ray's+arithmetic&pg=PP1&ots=1tWQT_uPi2&source=citation&sig=9FLY29dJ8-Mj5BFjbEFufrJ7EBw&oi=book_result&ct=result&hl=en

Rays Intellectual
http://books.google.com/books?id=cddHAAAAIAAJ&printsec=frontcover&dq=ray%27s++intellectual+arithmetic&ei=JTuKSM6LGYqeswPWjNiPDw

Rays New Practical
http://books.google.com/books?id=tb-blvznpS8C&printsec=frontcover&dq=ray%27s++practical+arithmetic&ei=ZTuKSK22Kof6sQOT1ImVBg

Rays New Intellectual
http://books.google.com/books?id=ZtEpb5LFNVcC&pg=PA5&dq=ket+to+ray%27s+new+intellectual+arithmetic&ei=ID2KSMDICIWQtAOf0Y04

Rays New Higher Arithmetic
http://books.google.com/books?id=cNdHAAAAIAAJ&printsec=frontcover&dq=ray%27s++new+higher+arithmetic&ei=7z2KSKSPA460sgP48MSXBg

Rays New Higher Key
http://books.google.com/books?id=lyRQTuXaiNUC&printsec=frontcover&dq=ket+to+ray%27s+higher+arithmetic&ei=rD2KSNb9E42AsgO20ankAQ

Rays New Test Example in Arithmetic
http://books.google.com/books?id=53O66PcmMEEC&printsec=frontcover&dq=Ray%27s+New+Test+Examples+In+Arithmetic&ei=OT6KSL2kFYqeswPWjNiPDw

McGuffey Readers for free online and downloadable
http://www.gutenberg.org/ebooks/search/?query=mcguffey+readers

Sonlight for Reading Level Tests
http://www.sonlight.com/blog/2011/07/what-is-my-childs-reading-level.html

Alpha Omega Free Whitepapers
http://www.aophomeschooling.com/whitepapers.php

Alpha Omega Free Placement Tests
http://www.aophomeschooling.com/diagnostic-tests.php

Lesson Pathways  free homeschool curriculum online
http://www.lessonpathways.com/info/homeschool

Free Printable Worksheets, Unit Lessons and More, not everything here is free, but they have tons of resources that are free.  Sign up for their email and you will be notified every time some new and free is posted.
www.currclick.com

Math Worksheets and more
http://www.homeschoolmath.net/

That is all I have time for today.  I will post more as I gather it all together.  I have used or perused through all of these sites and I recommend them. 
If you have more to add to the list, please add it in the comment section.  Lets help each other be as successful as possible, for a free as possible.