MIT OpenCourseWare
MIT OpenCourseWare is a web-based publication of virtually all MIT course content. It has a host of great courses for High School Students!
Khan Academy
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more.
edX
Best Courses. Top Institutions. Learn anytime, anywhere.
Art of Problem Solving
Their online classes bring outstanding students together with highly accomplished instructors to prepare the students for the rigors of top-tier colleges and internationally competitive careers.
Project Euler
Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
Brilliant
Learn from wiki pages and problems written by a community of mathematicians, scientists, and engineers.
Math, Physics Applets
These are some educational java applets Paul Falstad wrote to help visualize various concepts in math, physics, and engineering.
A video I made:
I wrote a C++ program to generate images of the Mandelbrot Set.
I rendered many frames corresponding to a zoom sequence.
I have included my video on this DVD, and uploaded it to YouTube. Click here to watch!