From Professor Weissman's Software:
Math911 contains step by step tutorials for High School and College Mathematics courses from Arithmetic Review through Algebra, Trigonometry, College Algebra, Precalculus and Statistics. When the random problem appears either click on see solution, see all steps, see next step or enter your answer. If you're wrong Math911 will step you through the solution. Enter your answer freeform, even fractions and exponents (using the up/down arrow keys). No multiple choices, just loads of word problems, equations and graphing (using your mouse). A comprehensive grading module will keep track of your progress as you move up the levels of difficulty. Very intuitive easy to master user interface.