This site offers a few games and simulations for algebra, algebra 2, trigonometry and geometry classes. These activites/simulations offer great visuals for instructing.
Karl Fisch is going to be teaching a blended algebra course and is looking for input. This blog will be interesting to follow and see what comments are left.
Animated conic sections using a double cone. Could be used to show all conic sections in geometry, as well as the degenerate possibilities in algebra 2
How to develop a circle equation in algebraic form when the circle touches the horizontal x-axis and learn how algebra is used in geometry to derive the equation of a circle in algebraic form in mathematics.