The list below is a combination of both religious and secular sources for homeschooling curriculum.
Sonlight
http://www.sonlight.com/
Robinson Self Teaching
http://www.robinsoncurriculum.com/
Oak Meadow
http://www.oakmeadow.com/
A Beka Home School
http://www.abeka.org/
Saxon
http://saxonhomeschool.hmhco.com/en/saxonhomeschool.htm
Alpha Omega
http://www.aophomeschooling.com/
Calvert
http://www.calvertschool.org/home-school/
The Classics
http://www.classicshome.com/prod_classics.htm
Time 4 Learning
http://www.time4learning.com/
Moving Beyond The Page
http://www.movingbeyondthepage.com/
Christopherus Curriculum
http://www.christopherushomeschool.org/curriculum.htm
Abbington Hill School
http://www.school-my-way.com/Index.html
Enki Education
http://www.enkieducation.org/
