This app really helps students put together all of the complex parts of a parabolic equation by allowing students to see the change in all of the parts of a parabolic equation when a portion of the general equation is changed. This does not give practice questions, but it does present a tutorial and diagram section that helps to improve student's conceptual understanding of parabolic equations.
Common Core State Standards:
A calculator that spits out an impressive amount of information about a given inputted parabolic equation including vertices, intercepts, a diagram, and even a parabolic tutorial.
Analysis of Change
attributes of parabolas