Online writing instruction, including reading and vocabulary elements. You can choose from two levels of membership (one includes teacher grading, the other provides rubrics for parent use.) Or you can purchase 6-week live classes. The price is a bit high, but membership is billed monthly, so trying it out wouldn't be too much of an investment.
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.