I have hunted them down for you and found. . .
9 Awesome Homeschool Freebies!
Science: Famous Inventors and Scientists: Archimedes (Enrichment Studies)
Writing: 40 Print-and-Go Writing Prompts for Grades 3-8 (WriteShop)
Music: “The Aviary” 15-Minute Music Lesson on Birds in Classical Music (Music in Our Homeschool)
Art: Free video art lessons (See the Light)
Bible: My Time with God and the Sermon Notebook (Not Consumed)
High School: Free Mini-Email Course for Preparing to Homeschool High School (7Sisters Homeschool)
Preschool: Ziggy ebooks for your preschooler (All About Reading)
History/Social Studies: Several different social studies freebies (SchoolhouseTeachers.com) (About American Presidents and the Declaration of Independence)
Notebooking: Over 600 various pages (Notebooking Pages)