Beginnings Publishing House - Rainbow Science: Homeschool science curriculum for junior high students written by Ph-D level scientists that are also homeschool parents.
Exploration Education Science Curriculum: Exploration Education offers physical science curriculum with hands-on projects and experiments for K12.
Great Science Adventures: K-8 science curriculum.
Home Training Tools: Provides science fair projects and information, microscopes, curriculum, and related resources. From a Christian perspective.
Homerschool.com - The leader in I Cubed Learning - Online Science Resources: Materials needed to teach and learn science using the power of the internet.
Homeschool Science Lessons: 150 online lessons in life science, earth science, chemistry, and physics available for purchase.
Homeschooling Science Fun: Articles and worksheets for the homeschooler.
Living Learning Books: Homeschool science curriculum and activity guides for a classical approach to education.
Safari Search Animal Classification System: Teaches your child to classify animals. Curriculum helps fulfill science requirements.
Science for Homeschoolers: Provides ideas and resources.
Science for Today and Tomorrow, Inc.: K - 6 hands-on science teaching system.
Science in a Nutshell: Science unit study kits for grades 2 through 6. Available topics include Earth Works, Electricity and Magnetism, The Human Body, Simple Machines, Space Science, Water World, and Living Things.
The Young Scientists Club: Subscription science curriculum developed by Harvard graduates for children ages 4-8. Children receive personalized science kits including lessons and materials.