Math Open Reference is a site that has interactive resources and information on different math topics, including Plane Geometry, Trigonometry, Coordinate and Solid Geometry, and function explorer tools
Brightstorm provides online study materials for mathematics and ACT and SAT preparation. The ACT and SAT preparation materials are not free, but the mathematics tutorials are free which are videos featuring mathematics teachers explaining and demonstrating how to solve mathematics problems, it covers Algebra, Geometry, Trigonometry, and Calculus.
Free Math Help offers students free mathematics tutorials, which are available as text based lessons or narrated video lessons. Algebra, Geometry, Trigonometry, Calculus, and Statistics tutorials are available for free to students.