These are free phonics learning materials in PDF format. There are flashcards, lesson plans, beginning reader stories, and lots more. The visuals are pretty simple, but effective; and the program looks pretty robust. (A note about religious content: the introductory material for parents is a bit heavy-handed in criticizing current teaching methods. There are also some references to God. A quick look at some of the stories and other resources didn't reveal any blatant religious references, but be cautious if you're looking for secular materials.)
Online, interactive program for learning music reading and theory.
This non-profit organization offers over 100 free self-paced, online, college level courses.
This online math program is designed to help students with math problems (including dyscalculia.)
This hands-on grammar curriculum includes CD ROMs, teacher manuals, and games for learning gramma
Online, super-hero themed science games for elementary and middle school levels.
This program includes videos, worksheets and quizzes for history learning in jr.