Curricula
These vary in structure. Some are organized day-by-day, some can be customized, some are outlines, some have all the materials but need to be paired with an outline. None are perfect for every child.
PreK Only
Sheppard Preschool: http://learninglynx.blogspot.com/2010/04/online-preschoolearly-k-games.html
Fisher Price Preschool: http://learninglynx.blogspot.com/2010/04/fisher-price-preschool.html
Pre-K Games: http://learninglynx.blogspot.com/2010/08/educational-pre-k-games.html
PreK through 5
Lesson Pathways: http://learninglynx.blogspot.com/2010/02/lesson-pathways.html
PreK through 8
Internet 4 Classrooms: http://learninglynx.blogspot.com/2010/04/more-curriculum-guidelines-and-outlines.html **
Learning Lynx Classroom: https://sites.google.com/site/learninglynxclassroom/ --under construction still
Time4Learning Scope and Sequence: http://learninglynx.blogspot.com/2010/04/more-curriculum-guidelines-and-outlines.html **
Beacon Learning Units: http://learninglynx.blogspot.com/2011/10/unit-plans-many-subject-many-levels.html
Easy Peasy Homeschool: http://learninglynx.blogspot.com/2013/01/complete-online-homeschool-curriculum-k.html
PreK through 12
About.com Homeschool: http://learninglynx.blogspot.com/2010/04/typical-course-of-study-k-12.html **
Brighthub: http://learninglynx.blogspot.com/2010/04/more-curriculum-guidelines-and-outlines.html **
Curriki: http://www.curriki.org/xwiki/bin/view/Main/
Guest Hollow: http://learninglynx.blogspot.com/2010/04/guest-hollow-homeschool-curriculum.html
Khan Academy (strongest on math and science)*
West Virginia Dept of Education
Saskatchewan Evergreen Curriculum
Middle School/High School Only
Homeschool College USA (High School): http://learninglynx.blogspot.com/2011/07/full-curriculum-for-high-school.html
SAS Curriculum Pathways (8-12)
* Do not contain a full curricula, but do include many classes in different disciplines. Generally these are lacking in language arts.
** Outline only--you would have to use this site and others to fill in individual lessons.