I recommend Starfall for free, online primary games to teach the alphabet, etc.
Reading Eggs teaches children how to read and work simple math. This is a paid service.
Ron Paul has recently presented Ron Paul Curriculum, which is free through the fifth grade. Tom Woods, Gary North and others have contributed to this educational marvel.
The John Birch Society has introduced Freedom Project Education
Khan Academy is a free source for K-12 education and even offers SAT and other test prep help!
Online California Achievment Test
For adults, a non-accredited source, teaching Austrian economics, politically incorrect history, logic, etc. is Tom Woods’s Liberty Classroom.
Excellent classes teaching Austrian economics, history, etc. from the Mises Institute
edX offers free classes from many universities…
Open Culture offers several classes…
Coursera offers lots of choices from numerous universities…
Alison Offers Lots of Choices…
Class Central, another site offering hundreds of free courses…