"The National Library of Virtual Manipulatives" (Software package promoted for sale, but they also have a free version. Very nice site chock full of online applets and manipulatives for teaching math concepts to students of all ages. ALL the online manipulatives – and there are HUNDREDS of them – are free. http://nlvm.usu.edu/en/nav/vlibrary.html
Digital History University of Houston has #homeschool history assignments, projects, primary source documents, textbook, an options for "light" or "in depth" study. Free, but the worldview may not fit all families.