This is the free page that is set up for the workshop Homeschool for Free.
Company Education Sites:
Many companies will have resources, lesson plans and other resources for you. Look for the words education, teachers, students or kids.
Large Government Resources
Free Lesson Plans
Oregon Trail info & trip Planner
Many Teachers have websites full of lesson plans, usually from the universities. Check your local university site, input lesson plans on their search box and find lesson plans made by teacher candidates.
Open Culture This is the place where you get free book, free movies and free college courses. Once your teen takes a course, they can then take a CLEP or other college equivalency test and then obtain college credit for their work.