This website is FULL of experiments to do with kids - It's even got a "preschool science" section!
Level It Books. App that tells you the DRA level just by scanning it!
wow - living math - learning math through read aloud literature. great book lists. lesson plans.
The KISS Grammar Site -- Recommended by Ambleside Online. Charlotte Mason style grammar instruction. Everything is FREE!
Free math curriculum - K-12, I believe, using all metric but can be adapted for English measurements as well.
Elementary Music Theory Worksheets, link to arcade
Piano Discoveries has free teaching games, printables, books, resources for ipads, and more for teaching piano
As a previous art teacher with two young kids (Now grown) while I was teaching I wish I had had one of these on my door. Every latchkey kiddo in the neighborhood wanted me for a Mom and some afternoons I found myself entertaining up to 10 children, some my kids didn't even know. Crazy! For neighborhood kids during homework and chore time. Very cool way to say no!
Sorry, we can't play door hanger - great for homework time, dinner time, etc.
Latin (year 4 & higher) - free google book "The First Year of Latin" by Walter Balfour Gunnison and Walter Scott Harley (1902)
Nature Journals-Ideas and Tips
LEARN GUITAR THE J.U.S.T.I.N. WAY - LEARN TO PLAY THE GUITAR with JUSTIN (online lessons & videos) wonderful online guitar course for beginners. But the J.U.S.T.I.N. method is the most effective method and fun available anywhere. The site includes loads of step-by-step playing lessons, videos, and a systematic learning method.
Free online guitar lessons